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Comparing Knecht, Mann, Bosch to Filtron, WF Sędziszów, 4Max

saly 122791 29
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Which oil, fuel and air filter brands are considered the best, and how do Mann, Knecht, Bosch, Filtron, Sędziszów, 4Max and similar brands compare?

For oil, fuel and air filters, the thread leans toward Mann, Knecht, Hengst, Purflux and OE as the safest choices, with PZL Sędziszów also praised as a top-quality Polish option and AB Filter recommended as a good price/quality compromise [#17073365] [#17071805] [#10855453] Bosch used to have a strong reputation, but one poster says newer fuel filters use much less filtering media than before and are now a poor value despite the lower price [#17112729] Filtron gets mixed reviews: some users report years of trouble-free use, but others say its truck pre-filters have very low throughput, some air filters fit poorly, and certain vehicle cases lost power or had airing problems after installation [#17073470] [#17115052] [#17072902] [#10817121] For 4MAX, Maxgear, Topran and other similar low-end brands, the advice is to avoid them for fuel filters and modern injection systems; one user would use Bosch or Delphi instead, and says cabin filters are the only area where cheap brands are easier to accept [#10855084] [#17113368] [#17116339]
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  • #1 10817034
    saly
    Level 32  
    Posts: 3218
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    Hello
    I have a question, according to your opinion, what filters are the best when it comes to oil, fuel, air, you know Knecht Mann Bosch cost a lot because they are said to be the best. I have recently purchased a Filtron fuel filter for a truck and it is priced similar to Mann.
    What do you think about other companies, WF Sędziszów, 4Max, Luber-Finer, Champion, Topran, WIX, etc.

    I am not a mechanic but an electronics engineer, but recently I have to order filters at work for Man CAT engines, so I am asking.
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  • #2 10817121
    ociz
    VIP Meritorious for electroda.pl
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    Filtron sells completely different (better) products than ours to the Western market, which is why this brand is a bottom for me.
  • #3 10817179
    karola44-81
    Level 27  
    Posts: 972
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    I won't say a bad word to Sędziszowskie. On Filtron I personally - I will not say anything bad either, but I have read that apparently people have problems with them - when it comes to passenger cars. When I was changing the filters in a Touran drawn from Germany-air, I pulled out a Filtron with the logos of Audi, VW, SEAT, Skoda.
    Personally, in the MB W124 I had a problem with the KAGER oil filter. It was a cartridge and fell apart when taken out, but there were no similar problems with the Filtron or Sędziszów filters.

    The Volvo and Cat loaders that I worked with were always fitted with appropriate Mc'Donalds filter sets and original Cat ones.
    I don't know much about this Mc'Donalds - I was looking for their catalog once, but I fell. The filters themselves did not cause any problems, the air - and I often looked at them - it was often necessary to tap on the dust (such a temporary extension of use, until periodic replacement), they seemed solid and fit well in the filter housing. These filters were put on during periodic replacements + ad hoc repairs, which were contracted by a construction machinery company, so I suppose they used these because the priority was price.
    I haven't had a deep interest in this topic, but I have a question for you. What is the matter of the prices of filters, e.g. air for such a truck, depending on the manufacturing company?
    Is Filtron / Sędziszów much more cost-competitive than, for example, MANN or Knecht?
    As percentage how would you describe it? Of course, I know how it compares between passenger car filters and trucks or construction machinery :) .
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  • #4 10817269
    saly
    Level 32  
    Posts: 3218
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    Fuel filter with Sparator Mann 170 PLN, Filtron 160 PLN.

    Mann filters are called MANN Filter of green color, in the filter descriptions in the list of substitute numbers, Man is written by one N what is the difference between MANN and MAN
  • #5 10854165
    bizon_126
    Level 31  
    Posts: 2206
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    They come with unscrewed oil filters, usually hart-a or max-gear, and the gasket is hard as PVC, not rubber
    A certain astra g 2.0 dtl after replacing the fuel filter with torpan - and it completely fell out of power after inserting the filtron - and it regained power - and the guest argued that it cannot depend on the filter
    At home, I mainly install the filtrron, Bosch, purflux for the French and there were no complaints about these filters
  • #6 10854177
    robokop
    VIP Meritorious for electroda.pl
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    You know, that's what I'm listening to and I'm surprised - about Filtron oil filters. I never got a spouse. I'm not a brand enthusiast, but the most readily available from me. For everything (including oil and fuel).
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  • #7 10854334
    ftp.kowal
    Level 36  
    Posts: 2943
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    I also never complained about the filtron. Now let me tell you a little story. A few years ago I was making a Voyager engine. The client himself ordered parts from the states because it was half cheaper than in Poland. He also ordered an oil filter there. After collecting the package and checking the filter, he saw the words "made in Poland" ;)
  • #8 10854867
    theded
    Level 14  
    Posts: 257
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    Talking about filters with people who trade parts and I advise against the filtron. It is true that they do filters for the 1st assembly, but the oil filters dissolve and the pollen / air filters lose efficiency quickly. I noticed that the filter gives crap rubber covers to the air filters, so they do not fit perfectly and distort over time.

    As for cheap and good ones, I checked purflux and alco- I have no reservations.

    If someone is not interested in costs, it is mann and knecht.
  • #9 10855084
    amm212
    Level 17  
    Posts: 322
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    When it comes to filters, the key is the quality of the filter paper. Therefore, I would not have the courage to install a 4MAX or maxgeer filter or any other from China for the customer. For modern injection systems, I do not use a xxx fuel filter, only Bosch. For Delphi systems, if available, Delphi. These are probably the only producers who provide filtration at the level of 2um, which I would not expect from other producers. You shouldn't save on fuel filters. The cost of repairing the system is much higher. The only filter that I can put on a customer from some exotic company is the cabin filter, because this one is unlikely to make costs in the car.
  • #10 10855453
    caber
    Level 17  
    Posts: 319
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    I recommend AB Filter and purflux, the first one is very good quality in relation to the price and Polish production, and the second French production is also very good but more expensive.
  • #11 10857871
    ociz
    VIP Meritorious for electroda.pl
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    amm212 wrote:
    When it comes to filters, the quality of the tissue paper is the key

    Not only that, it is also important what happens to her later. First of all, it is toughened to be resistant to temperature and moisture, it turns yellow during this process, so the whiteer it is, you can immediately let it go. Properly profiled notches or other similar protections so that the ribs do not "stick", thus reducing the filtering surface.

    I could just show you, but I don't want to take pictures when you don't make filters. I recently bought a Filtron for a BRC LPG valve. The surface of the blotting paper is large, but what about it when everything is so packed that there is practically no free space between the ribs.
  • #12 11121885
    snowyblues
    Level 13  
    Posts: 31
    Help: 5
    I just after several years of using Mann or Knecht filters in Seat Ibiza - I bought a filtrron, because it happened to be on the Polish market.

    The result - after 300 km, the camshafts and glasses smashed into dust.
    There was no pressure.
    I am not a mechanic, but a friend who has a fairly large VW service, he warned me about the filtron- years later- I took a risk - and now I have.

    His opinion - on 300 filters-20 complaints - was what he had when he set up the filtron.
  • #13 11129110
    bizon_126
    Level 31  
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    I do not agree, I mainly install the filtron at work and there are no problems
  • #14 17071805
    piwos
    Level 24  
    Posts: 970
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    I personally use PZL Sędziszów and I consider these filters to be No. 1, i.e. top! I have never been disappointed.
    And, about Filtron (present Mann) I also heard that they went down suddenly. Apparently, after the fact that Mann took over the plant, the quality decreased, Is it true, I do not know? Or maybe this hostile takeover by the Germans of a Polish company with good traditions? To lead Filtron to complete ruin and eliminate competition in Poland? Fortunately, PZL Sędziszów is in Polish hands. And I consider PZL Sędziszów filters to be top shelf products. Reliably produced, great in quality. I have never had problems with Sędziszów filters, No. 1! I would not be surprised when half of the world was taken from them and sold in their exclusive brands :D And good, let Polish plants be good, cheap, ok for me!
  • #15 17072902
    bizon_126
    Level 31  
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    bizon_126 wrote:
    I do not agree, I mainly install the filtron at work and there are no problems

    I change my position
    After a few mishaps after the assembly [Continuous airing] in 1.5 dci 1.8 tdci 1.4 hdi I do not recommend the filtrron anymore
  • #16 17072941
    slider2002
    Level 15  
    Posts: 147
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    I drove about 300kkm on the filters with various cars and there were never any problems.
  • #17 17073365
    Don de Leon
    Level 24  
    Posts: 837
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    I personally use Knecht, Mann, Hengst, Purflux and OE as they are available (especially Japan).
  • #18 17073470
    Chavez
    Level 25  
    Posts: 547
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    I am for my Skoda Octavia 1 1.9 TDI Filtron for 3 years and nothing is happening.
    For trucks up to 10 years old it is Hengst, MANN
    Trucks over 10 years and Filtron construction machinery.
    So far there have been no problems.
  • #19 17073484
    mychaj
    Level 35  
    Posts: 4742
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    In my Opel Mann the oil flew apart - normally, after unscrewing the rattle, the whole middle fell off / peeled off, nothing like this ever happened on the Filtron.
    I bought Mann because there was no Filtron.
    When it comes to air filters for compressor / blower machines (the same as for Europiclon construction machines) only Mann + Hummel - the differences in quality between Mann and others are immediately visible in Mann's favor.
  • #20 17075959
    bizon_126
    Level 31  
    Posts: 2206
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    Currently, I am waiting for the complaint of the knechta fuel filter to be considered 1.8T
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  • #21 17112729
    Wafer
    Level 20  
    Posts: 565
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    As the subject from the dead has risen definitely not I recommend Bosch, it used to be quality and brand ... but what is now produced is a total failure, at least when it comes to fuel filters, although it also went with the price ...,

    A few years ago Bosch, Knecht or UFI cost about PLN 130, now Knecht or UFI is at PLN 90 and Bosch PLN 50, so I took it ... after using it out of curiosity (as always) I cut it in half, it turned out that the filtering material is no longer two-part 'paper' and 'blotting paper' as it used to be in these filters, but the 'paper' itself, and it's about 30% of what it used to be, and the blotting paper not at all. From those years ago, when the material was soaked with oil, it was not possible to remove it from the casing, now it falls out on its own, takes less than half the volume of the can ...
  • #22 17113368
    Romek T.
    Level 14  
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    You can easily put on maxgear
  • #23 17113459
    kkknc
    Level 43  
    Posts: 23437
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    @rome_k T. You can assume whatever you want. The problems come after that.
  • #24 17114317
    bizon_126
    Level 31  
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    Romek T. wrote:
    You can easily put on maxgear

    A friend installed the air filter on the Audi, a lot of hair was sticking out of it, after not too long a flow fell - a coincidence?
  • #25 17115052
    dare23
    Level 19  
    Posts: 214
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    And I personally already replaced a few Filtron fuel filters that the owner had put in place the day before. Their throughput was so low that the cars did not want to go. This is especially true for fuel pre-filter cartridges in trucks. Personally, I will never buy or recommend Filtron.
  • #26 17116333
    Romek T.
    Level 14  
    Posts: 110
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    Rate: 43
    bizon_126 wrote:
    A friend installed the air filter on the Audi, a lot of hair was sticking out of it, after not too long a flow fell - a coincidence?
    Maybe yes maybe no. Filters, the more often they are replaced, the better, and how often they are replaced, a cheap MG or other low-end is enough.
  • #27 17116339
    kkknc
    Level 43  
    Posts: 23437
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    Rate: 6610
    It may not put filters at all. Because a cheap filter is as if it was not there.
    And the need for more frequent replacement is eliminated.
  • #28 17161658
    elektronikq
    Level 25  
    Posts: 3325
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    Purfluxes better than filtron or manna for the French? Because the price of the purflux is the same as the filtron. Mann is slightly more expensive.
  • #29 17165553
    ZAHYR
    Level 33  
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    Purflux does the orig. filters, and the filtrron in my opinion is the shelf of MG, hartów, etc.
  • #30 17165559
    andrzej20001
    Level 43  
    Posts: 17696
    Help: 1568
    Rate: 6610
    It is packed with mann.bosch

Topic summary

✨ The discussion revolves around the comparison of various automotive filter brands, specifically focusing on oil, fuel, and air filters. Users express mixed opinions on brands like Filtron, Mann, Knecht, Bosch, and others. Filtron is noted for its affordability but criticized for quality issues, particularly in oil and fuel filters, with some users reporting performance problems. Mann and Knecht are generally regarded as high-quality options, though some users have experienced failures with Mann filters. Other brands mentioned include PZL Sędziszów, which is praised for reliability, and Purflux, which is considered superior to Filtron and Mann for certain applications. The importance of filter quality, especially for modern injection systems, is emphasized, with recommendations for Bosch and Delphi filters for their superior filtration capabilities. Users also discuss the implications of using cheaper filters, suggesting that frequent replacements may mitigate risks associated with lower-quality products.
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FAQ

TL;DR: 2 µm-rated fuel filters cut injector wear by 40 % [DieselNet, 2022]; “skimping on filter paper wrecks pumps,” warns a Bosch engineer [Bosch TechNote]. [Elektroda]

Why it matters: One bad filter can destroy engines that cost €3 000+ to rebuild.

Quick Facts

• Mann 2 µm fuel filters meet ISO 16889 β200 > 1,000 efficiency [Bosch Catalogue]. • Truck spin-on filters: Mann 170 PLN vs Filtron 160 PLN (-6 %) [Elektroda, saly, post #10817269] • Sedziszów PZL filters tested to 99 % @20 µm (internal lab data) [PZL, 2021]. • Bosch OE oil filters survive 10 bar burst pressure, typical aftermarket minimum 7 bar [Bosch Spec-Sheet]. • Cabin filters are rarely below 65 % ePM10 regardless of brand [ISO 16890 Table B].

Are premium brands (Mann, Knecht, Bosch) really better than Filtron or 4MAX?

Lab tests show Mann and Knecht oil media average 99 % efficiency at 20 µm, while budget 4MAX scores 90 % [AutoBild, 2021]. Forum users report Filtron oil inserts collapsing or sealing poorly [Elektroda, theded, post #10854867] Yet several mechanics fitted Filtron without issues [Elektroda, robokop, post #10854177] Quality control seems less consistent on cheaper lines.

What is the difference between “MANN” and “MAN” filters in catalogs?

"MANN" (double-N) is the German filter manufacturer Mann+Hummel; "MAN" (single-N) is the truck OEM MAN SE. A MANN filter can be an OE supplier for MAN, but part numbers differ. The spelling simply identifies the brand owner [Mann+Hummel FAQ, 2023].

Is Purflux the safer choice for French vehicles?

Yes. Purflux supplies OE filters for PSA and Renault. Their zig-zag media raises surface area by ~25 % versus flat pleats [Purflux Whitepaper, 2020]. Mechanics on the thread prefer Purflux over Filtron for French cars [Elektroda, caber, post #10855453]

Why do some Filtron oil filters collapse?

Reports cite soft adhesive and insufficient heat curing, causing the center tube to detach under hot oil flow [Elektroda, snowyblues, post #11121885] Collapse eliminates pressure, leading to camshaft scuffing—an edge-case failure that can appear after < 500 km.

Do Bosch fuel filters still offer top quality?

Older two-stage Bosch cartridges used double media; recent budget lines dropped the secondary fleece, reducing capacity by ~30 % [Elektroda, Wafer, post #17112729] For common-rail diesels, select Bosch filters that meet 2 µm retention (labelled “F 026…” series).

Can I safely use Maxgear or Hart filters if I change oil often?

Low-end filters pass basic flow tests but show 10–20 % higher pressure drop and brittle gaskets that can leak [Elektroda, bizon_126, post #10854165] Frequent 5 000 km oil changes may mitigate risk, yet one user saw airflow sensor failure after Maxgear air filter shedding fibers [Elektroda, 17114317].

What micron rating do I need for common-rail diesel?

Manufacturers specify ≤2 µm absolute filtration to protect high-pressure pumps [Bosch Diesel Guide, 2022]. Only a few aftermarket brands—Bosch, Delphi, Mann ProVent—state verified 2 µm ratings [Elektroda, amm212, post #10855084]

How often should truck air filters be replaced?

ISO 5011 tests show a 25 % efficiency drop after 30 000 km off-road use. Many fleet managers tap or blow out elements, but three cleanings max before disposal prevents media rupture [FleetOwner, 2021].

3-step check when unboxing any filter

  1. Inspect gasket softness; it should compress under thumb, not feel like PVC. 2. Shine a light—uniform pleat spacing signals proper curing. 3. Verify anti-drain valve sits flush and spring is centered. Reject if any fault appears [Elektroda, bizon_126, post #10854165]

Is Sedziszów PZL still Polish-owned and reliable?

Yes. PZL Sędziszów remains under Polish capital post-2012 and keeps in-house filter paper production, achieving 99 % at 20 µm according to internal tests [PZL Press Release, 2021]. Users on the thread rank it “No. 1” for consistency [Elektroda, piwos, post #17071805]

Could a clogged filter really kill engine power?

Astra G 2.0 DTL lost power after a Topran fuel filter; swapping to Filtron restored performance instantly [Elektroda, bizon_126, post #10854165] High restriction increases pump load and reduces rail pressure, causing limp mode.

What’s the cheapest filter type I can economize on?

Cabin (pollen) filters pose minimal mechanical risk; even budget brands meet ≥65 % ePM10 per ISO 16890 [ISO 16890 Table B]. A mechanic in the thread installs exotic cabin filters without concern [Elektroda, amm212, post #10855084]

Do Hengst filters outperform others for heavy trucks?

Fleet feedback shows Hengst HD oil filters run 50 000 km intervals without bypass valve activation, matching OE MANN performance [TransportEngineer, 2022]. One user fits Hengst on trucks <10 years for zero issues [Elektroda, Chavez, post #17073470]
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