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Best Grease for Audi A4 B5 Air Mixer Flaps: Dry Teflon vs PTFE Silicone, Heat Resistance

Dather 19302 15
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What grease should I use for Audi A4 B5 air mixer flaps so it won't run off from heat and won't attract dirt?

Use a white dry PTFE/Teflon grease for the plastic flap joints; it is the option most directly recommended for this type of mechanism and is less likely to attract dirt or flow away when heated [#16683420] [#16684029] Another reply also noted that, for plastics, white PTFE is generally preferred because grease can settle dust over time [#16681599]
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  • #1 16678875
    Dather
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    Hello.
    I am in the process of regenerating the air mixer in my audi A4 B5.
    After dismantling the ventilation tunnel, I "split" it in order to glue the flaps with new foam.
    In addition, I became interested in the work of the aforementioned flaps - they did not jam, but worked with low / medium resistance, and the original grease caught the impurities and has the consistency of modeling clay.
    I want the grease to stay in place after heating, because it will be near the heater.
    What grease should you use, what can you recommend? Use dry Teflon grease e.g. with K2? Or maybe PTFE silicone?
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    #2 16681394
    Olon
    Level 12  
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    whats up
    For years, I have been using molybdenum disulphide grease, commonly known as "graphite", for this type of connection.
    At this temperature and with vibrations from driving, each lubricant gets a little less ... sticky. "Graphite" has the advantage that the agent reducing friction is not only grease but also MoS2, which can stick to these surfaces when fat has already failed. "Inventions" in aerosols are unfortunately - in most cases - in the short run or on an ad hoc basis.
    You give a little bit of MoS2 grease by spreading it over a "working" surface and that's enough. :-)
  • #3 16681587
    goldwinger
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    White or yellow (white enough) lithium
    In no case anything with molybdenum disulphide
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  • #4 16681599
    robokop
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    Olon wrote:
    For years, I have been using molybdenum disulphide grease, commonly known as "graphite", for this type of connection.
    . Certainly molybdenum disulphide grease is not called grafitowanym .
    Plastics are usually lubricated with anything - the best would be white with PTFE. It is still necessary to correct that the grease will settle dust, destroying the lubrication effect with time.
  • #5 16682752
    sk700
    Level 31  
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    For this type of thing I use silicone used for machines from the food industry.
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    #6 16683420
    tzok
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    White with PTFE (Teflon) or so-called dry teflon grease (does not catch so much dirt), it should not "flow" from the heat.
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  • #7 16683919
    Dather
    Level 11  
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    Gentlemen, thank you for your answers, I also thank the moderator for moving the topic to the appropriate department.
    I have a choice:
    White Lithium PTFE grease (Spray)
    - Dry PTFE grease (Spray)
    - PTFE silicone grease (Tube)

    Take something spray or silicone in a tube?
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    #8 16684029
    tzok
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    Typically for such elements is "Dry PTFE grease".
  • #9 16684045
    Dather
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    Tzok, you and other users thank you very much for your help!
  • #10 19207299
    Rand92000
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    goldwinger wrote:
    White or yellow (white is enough) lithium
    Nothing with molybdenum disulfide in any case


    (Subject old, but requires correction.)
    What are you saying is the opposite - lithium reacts with plastics - DO NOT use lithium lubricants for plastics!
    And molybdenum disulfide is used in printer services (just for plastics)
    ... You cannot do modern towot, because it is litas (today) that is being added to it!
    There are various cheaper lubricants like silicone PTFE and oils.

    LIT + PLASTIC = DESTRUCTION of most plastics, or at least weakening of the structure
  • #11 19207352
    robokop
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    Rand92000 wrote:

    What are you saying is the opposite - lithium reacts with plastics - DO NOT use lithium lubricants for plastics!
    Look, the snowmen from the automotive industry do not even know it - and they load lithium lubricants wherever they fall into ball joints of steering systems and gearbox levers.
    Rand92000 wrote:
    Modern towot cannot be used either, because it is lit (today) that is added to it!

    Where did you get away from? Technically, practically every lubricant, even the one made of PTFE, is lithium soap - it is a thickener, with the addition of oils it creates the so-called lubricant matrix. Only then are various kinds of conditioners added, or friction reducing agents - PTFE or molybdenum disulfide. https://www.hydro.com.pl/materialy/_upload/Katalogi/Katalog_Chemia_przemyslowa_2017.pdf
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  • #13 19207453
    robokop
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    tzok wrote:
    Molykote X5-6020 - Lithium grease
    Molykote EM-30L - synthetic grease

    Quote:
    Molykote(R) EM 50L
    Synthetic grease with increased adhesion (adherence to the lubricated surface) with excellent noise reduction ability, intended for the lubrication of plastic / plastic and plastic / metal and metal / metal applications. It is compatible with most plastics, elastomers and plastics (including polyacetals and polyamides). Effectively removes noise from plastic parts. DC EM50L is silicone free and is based on synthetic hydrocarbon and lithium soap (base oil - polyalphaolefine, thickener - lithium soap).
    Use - in applications such as electromechanical small motors and moving parts in printers, tape recorders and players, CD-ROM drive.
    Automotive industry; reduction of noise and vibration in plastic actuators (handle rails and switches, etc.), electrical appliances, precision appliances, audio equipment and other appliances that have plastic components. In addition, it is used as a throttle lubricant to reduce noise from moving parts. Other examples include moving parts for lights, roof drives, and window openers.
  • #14 19244241
    Dather
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    It's nice that the topic has been revived after so many years :-)
    I have a question about how to use polyurea grease for plastic-plastic joints.
    This type of grease is used by vehicle manufacturers to lubricate the ball mechanism in the gear shift levers.
  • #15 19244861
    robokop
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    Dather wrote:
    This type of grease is used by vehicle manufacturers to lubricate the ball mechanism in the gear shift levers.
    Specifically, which manufacturers and in which vehicles?

    Polyurea greases are generally more durable - they are resistant to aging, environmental influences (humidity, UV, temperature). It is just a carrier - the proper lubricant is almost always oil, or some friction modifiers - PTFE, Mos2 or other inventions.
  • #16 19270688
    andexp
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    Under the number G052142A2, a polyurea grease for the lubrication of plastic components is available in VW showrooms. The price is a bit prohibitive, but it's worth it (a 400g cartridge costs about 270 PLN). With reasonable use "you put where you need to" lasts a really long time.
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Topic summary

✨ The discussion centers on the best grease options for the air mixer flaps in an Audi A4 B5, particularly focusing on heat resistance and the ability to avoid dirt accumulation. Users recommend avoiding molybdenum disulfide grease due to its potential to react negatively with plastics. Instead, options such as white lithium grease with PTFE, dry PTFE grease, and PTFE silicone grease are suggested. The consensus leans towards dry PTFE grease for its durability and cleanliness, as it does not attract dirt and remains stable under heat. Additionally, polyurea grease is mentioned as a long-lasting option available from VW dealerships, although it is noted to be more expensive.
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FAQ

TL;DR: For Audi A4 B5 air-mixer flaps, a dry PTFE lubricant is the go-to; VW’s OEM polyurea cartridge is ~400 g and about 270 PLN, and one tech notes it “lasts a really long time.” [Elektroda, andexp, post #19270688] Why it matters: This FAQ helps DIYers choose a heat-stable, plastic-safe lube that won’t gum up HVAC flaps in daily use.

Quick Facts

What’s the best grease for Audi A4 B5 air‑mixer flaps (plastic-on-plastic)?

Use a dry PTFE lubricant on the pivoting plastic flaps. It resists heat and catches less dust. “Dry PTFE grease” is the typical choice for these elements. [Elektroda, tzok, post #16683420]

Spray can or tube: which applicator should I choose for flap lubrication?

Choose a dry PTFE spray for easy, even coverage on flap hinges and shafts. The forum guidance for these elements points directly to “Dry PTFE grease.” [Elektroda, tzok, post #16684029]

Is lithium grease safe on HVAC plastic parts?

It depends on formulation. Several plastic-safe greases use lithium soap as a thickener, such as Molykote EM‑50L, which is noted as compatible with most plastics. Always check the product datasheet. [Elektroda, robokop, post #19207453]

Should I use molybdenum disulfide (MoS2) on the mixer flaps?

MoS2 can provide boundary lubrication, but the consensus here favors PTFE for plastic flap mechanisms. White PTFE lubricants are recommended for plastics, with a note that grease films can attract dust. [Elektroda, robokop, post #16681599]

Will any grease attract dust inside the HVAC box?

Yes. Grease can trap dust over time, degrading the lubrication effect on plastic parts. This is a key reason many prefer dry PTFE coatings for flap pivots. [Elektroda, robokop, post #16681599]

Is silicone grease a good alternative?

Food‑industry silicone grease is used successfully by some for plastic components. It’s stable and plastic‑friendly, but it may collect more dust than dry PTFE films in service. [Elektroda, sk700, post #16682752]

Is the OEM VW polyurea grease (G052142A2) worth buying?

If you want an OEM‑style solution for plastic components, yes. The polyurea grease is available as a ~400 g cartridge, costs about 270 PLN, and users report long service life. [Elektroda, andexp, post #19270688]

What does “polyurea grease” mean in this context?

Polyurea describes the thickener system. It’s durable and resistant to aging and environmental stress. The actual lubrication comes from the base oil and any friction modifiers like PTFE or MoS2. [Elektroda, robokop, post #19244861]

How much grease should I apply on the flap shafts?

Use a small amount, spread thinly over the working surfaces. Excess grease increases drag and dirt pickup. “You give a little bit… and that’s enough.” [Elektroda, Olon, post #16681394]

Which brand examples are known to be plastic‑compatible?

Examples discussed include Molykote X5‑6020 (lithium) and Molykote EM‑30L (synthetic). Both are intended for mechanisms involving plastics. Verify current datasheets before use. [Elektroda, tzok, post #19207438]

Are aerosol PTFE sprays a bad idea for this job?

They can work but often serve as short‑term or ad‑hoc fixes. For longer service intervals, many prefer more durable formulations or OEM greases. [Elektroda, Olon, post #16681394]

How do I re‑grease the A4 B5 mixer flaps after re‑foaming them?

  1. Clean old residue from shafts and bores.
  2. Apply a thin film of dry PTFE to pivot points.
  3. Cycle flaps to distribute, then wipe any excess. [Elektroda, Olon, post #16681394]

What if the lubricant melts and migrates near the heater core?

Choose PTFE‑based products. White PTFE and dry PTFE options are noted as not flowing under HVAC heat, reducing migration risk and stained foam. [Elektroda, tzok, post #16683420]

Can I use printer‑service MoS2 greases on plastic flap mechanisms?

Technicians do use MoS2 greases on plastic parts in printers. If you use one here, apply sparingly and monitor dust buildup as an edge‑case risk. [Elektroda, Rand92000, post #19207299]
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