logo elektroda
logo elektroda
X
logo elektroda
Advanced Search
logo elektroda

VW Polo 1.2 12V High Oil Consumption - Possible Causes? Valve Seals?

swarzu 72216 29
Best answers

What causes very high oil consumption in a VW Polo 1.2 12V with no visible leaks and slightly low compression?

With no visible leaks, the engine is burning oil internally; the forum initially suspected valve stem seals, especially because the smoke appeared at high revs and when lifting off the throttle [#12357216] [#12357302] If compression is normal, valve seals are a likely suspect, and one reply said they can sometimes be replaced without removing the head for about 200 [#12357302] [#12357353] In the later follow-up, the actual fault turned out to be worn piston rings, so the engine had to be disassembled [#13196345] After the rings were replaced, the car stopped consuming oil [#13196345]
Generated by the language model.
ADVERTISEMENT
Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
Report a violation of the law
Reply | New topic
  • #1 12357101
    swarzu
    Level 9  
    Posts: 7
    Rate: 24
    The Polo with the 1.2 12V engine consumes a lot of oil. After driving about 400 km, I had to add a liter.
    The compression was measured, I don't know the exact measurement values, but the authorized VW said that the compression is slightly lower than it should be.
    The car accelerates and has no problems with starting.
    Tested on mineral, semi-synthetic and synthetic oils, I have never added any "improvers" or "repairers"

    Does anyone know what could be the cause? I heard it may be a problem with valve seals???
  • ADVERTISEMENT
  • #2 12357154
    kaputo
    Level 21  
    Posts: 465
    Help: 37
    Rate: 128
    What mileage, year?
  • #3 12357168
    Sołtys_Elbląga
    Level 31  
    Posts: 1882
    Help: 113
    Rate: 562
    Mileage in Poland doesn't matter anyway. And what does the vintage have to do with damage? It's probably going somewhere... 400km and letters? Or maybe it's leaking or drinking already?
  • #4 12357189
    LA72
    Level 41  
    Posts: 6582
    Help: 646
    Rate: 1648
    Proven coolant, quality, quantity.
    What kind of smoke from the exhaust pipe?
    Engine dry from the outside?
  • #5 12357200
    mtracz
    Level 29  
    Posts: 1017
    Help: 110
    Rate: 914
    If it's not dripping, it must be burning. There is no smoke from the muffler when you turn it on in the morning?
  • #6 12357216
    swarzu
    Level 9  
    Posts: 7
    Rate: 24
    the engine is completely dry, parked in one place, there is no trace of oil on the pavement

    Polo from 2002

    the smoke is blackish when it degasses, but I thought that with the amount of oil burned there should be gray behind me, but it is moderate, at high revs around 5000 it is only clearly visible

    Added after 1 [minute]:

    as for the coolant, I top it up, but the coolant expansion tank is cracked, I top it up so I'm sure it didn't overheat, I don't know about the previous owner

    and here's my question, if it was overheated, what could have gone wrong, seals, rings??

    Added after 55 [seconds]:

    when starting it there is no problem, it starts smoking at high revs and when it goes down
  • #7 12357257
    Strumien swiadomosci swia
    Level 43  
    Posts: 27411
    Help: 1403
    Rate: 6379
    swarzu wrote:
    at high speeds around 5000 it is only clearly visible

    Because it burns out in the muffler.

    Describe candles.
  • #8 12357266
    swarzu
    Level 9  
    Posts: 7
    Rate: 24
    the spark plugs have been replaced, I don't know what type they were fitted, I haven't removed them, I don't know if they are full of soot
  • ADVERTISEMENT
  • #9 12357302
    psilos1
    Level 32  
    Posts: 1822
    Help: 203
    Rate: 873
    swarzu wrote:
    The Polo with the 1.2 12V engine consumes a lot of oil. After driving about 400 km, I had to add a liter.

    If there are no visible leaks, with such an appetite for oil, it probably smokes like "Batory". If you have measured the compression and you say it is normal, then the valve seals remain.

    Added after 3 [minutes]:

    swarzu wrote:
    it starts to smoke at high revs, and when the revs drop

    Obvious valve seals
  • ADVERTISEMENT
  • #10 12357320
    swarzu
    Level 9  
    Posts: 7
    Rate: 24
    In my opinion, the smoke with such oil consumption is small, sometimes you can see cars on the streets behind which it is gray or black, but when you step on the gas pedal it smokes a little.

    Added after 59 [seconds]:

    I will add that I had such high consumption on the highway, where I constantly maintained 140, the maximum the car drove was 160

    Added after 1 [minute]:

    Quote:

    Obvious valve seals


    Do you know how much the replacement service may cost?
  • #11 12357353
    psilos1
    Level 32  
    Posts: 1822
    Help: 203
    Rate: 873
    Look for a smart mechanic who will replace the rubber bushings without removing the head (the gasket, screws, fluids, and any planning are removed) - you should be able to do it in 2 hundred
  • #12 12357375
    swarzu
    Level 9  
    Posts: 7
    Rate: 24
    thank you for the tips, I hope this will be the case, that it is not a matter of rings etc
    If I find out after it's done, I'll write about it, of course
  • #13 13195595
    Josey
    Level 13  
    Posts: 119
    Help: 1
    Rate: 46
    It's a pity that my friend didn't write back whether he fixed the fault, because I have such a problem, today my oil light came on again, tomorrow I'll ask the workshop what the cause is and if it can be repaired without disassembling the engine.
  • #14 13196345
    swarzu
    Level 9  
    Posts: 7
    Rate: 24
    Hello
    Unfortunately, my Polo had a problem with the rings, the engine had to be disassembled :/
    the rings were replaced, the car no longer consumes oil
  • #15 13204444
    mtracz
    Level 29  
    Posts: 1017
    Help: 110
    Rate: 914
    Josey wrote:
    It's a pity that my friend didn't write back whether he fixed the fault, because I have such a problem, today my oil light came on again, tomorrow I'll ask the workshop what the cause is and if it can be repaired without disassembling the engine.

    Does it eat so much oil that the pressure light comes on?
  • #16 20495359
    marcinzalewski215
    Level 2  
    Posts: 2
    The car consumes oil and smokes blue now I don't know if it's valve seals or rings, if anyone had the same problem please contact me by phone 786843728 thank you for your help
  • #17 20495367
    Miro0412
    Level 11  
    Posts: 98
    Help: 1
    Rate: 7
    marcinzalewski215 wrote:
    The car consumes oil and smokes blue now I don't know if it's valve seals or rings, if anyone had the same problem please contact me by phone 786843728 thank you for your help


    Now, man, you've reheated the cutlet. If you have such doubts, go to a mechanic.
  • #18 20495387
    marcinzalewski215
    Level 2  
    Posts: 2
    Well, I was there and they don't know, they say that it's best to do a major job in such an old car, it defeats the purpose because the seals leak without removing the head, but I don't know if that's it or not, it starts leaking when I clean the pneumothorax and when I unscrew the cap, it sucks in. renke
  • #19 20496096
    Strumien swiadomosci swia
    Level 43  
    Posts: 27411
    Help: 1403
    Rate: 6379
    The renovation of this strudel exceeds the value of the car and much more... scrap it and that's it.
  • #20 20498957
    Miro0412
    Level 11  
    Posts: 98
    Help: 1
    Rate: 7
    Strumien swiadomosci swia wrote:
    The renovation of this strudel exceeds the value of the car and much more... scrap it and that's it.

    Depends, has he done anything before? What condition is the sheet metal in?
    If everything is OK, it's worth it, because he knows what he has.
  • #21 20498980
    sigwa18
    Level 43  
    Posts: 11688
    Help: 1168
    Rate: 3264
    The rings need to be replaced and probably the pistons, the head needs to be replaced. The junk alone is about PLN 2,000 in a car worth maybe PLN 5,000. If the cylinders are worn out, it's just a different column. If you do it yourself, it will still be economical. Unless you mess something up. Taking it to a workshop costs between 2/3 and 3/4 of the car's value.
  • #22 20499346
    Miro0412
    Level 11  
    Posts: 98
    Help: 1
    Rate: 7
    sigwa18 wrote:
    The rings need to be replaced and probably the pistons, the head needs to be replaced. The junk alone is about PLN 2,000 in a car worth maybe PLN 5,000. If the cylinders are worn out, it's just a different column. If you do it yourself, it will still be economical. Unless you mess something up. Taking it to a workshop costs between 2/3 and 3/4 of the car's value.

    With this kind of thinking, only new cars are driven in Poland...
  • #23 20499361
    sigwa18
    Level 43  
    Posts: 11688
    Help: 1168
    Rate: 3264
    It's better to add oil. There is no point in deceiving yourself that it is valve seals.

    You can put new rings on the head, slightly hone the cylinders, hone it for PLN 50 from Allegro. Put a new gasket under the heads and screws. Screw everything back. Pray to the patron saint of mechanics and maybe it will work or it will take half of what it is now. Unfortunately, it either gets better and the effect is there. Or you do something and hope for a miracle.
  • #24 20508651
    Alha
    Level 13  
    Posts: 141
    Help: 5
    Rate: 18
    Buy a pole on an auction website and drive
  • #25 20675100
    stawpol2
    Level 13  
    Posts: 287
    Rate: 67

    Hello, I'll join in, I have the same engine and the same problem. Today I measured its pressure in 1st gear - only 12, in 2nd and 3rd - 14, so it's the same for the engine, rubbish?
  • #26 20675232
    sigwa18
    Level 43  
    Posts: 11688
    Help: 1168
    Rate: 3264
    As long as it starts, runs relatively smoothly and you don't add oil like in a two-stroke, I wouldn't worry. I just wouldn't go on further journeys.
  • ADVERTISEMENT
  • #27 20675298
    Alha
    Level 13  
    Posts: 141
    Help: 5
    Rate: 18
    You can try pouring rinse onto the pistons overnight. Maybe just the rings are stuck

    Added after 1 [minute]:

    >>12357101
    Maybe buy some rinse and do it. You can pour it onto the pistons and leave it overnight to dissolve the carbon deposits. Of course, an oil change is necessary after such a procedure
  • #28 21209216
    IreuN
    Level 12  
    Posts: 93
    Help: 1
    Rate: 17
    I have a slightly different question, I have this engine but in the 6V version, i.e. BBM, is there a chance to transfer the 12V post to my Polo? I'm mainly asking because there are a lot of 12Vs on the auction portal, and 6Vs are scarce. Or maybe another swap? Anyone have any advice?
  • #29 21209370
    Alha
    Level 13  
    Posts: 141
    Help: 5
    Rate: 18
    A rather coarser job. Even if mechanically it goes in, the hardware and electrics will be an issue. Certainly a different engine controller, harness
  • #30 21209592
    Strumien swiadomosci swia
    Level 43  
    Posts: 27411
    Help: 1403
    Rate: 6379
    >>21209216 You Ku[ute the whole engine with hardware and computer and harness and you have 12v.
Reply | New topic
Report a violation of the law

Topic summary

✨ The discussion revolves around a VW Polo 1.2 12V experiencing high oil consumption, with the owner reporting the need to add a liter of oil after driving 400 km. The authorized VW service indicated slightly lower than normal compression. Various potential causes were suggested, including valve seals, piston rings, and possible leaks. The owner confirmed no visible oil leaks and described the exhaust smoke as blackish, particularly at high revs. Responses included advice on checking spark plugs, the condition of the engine, and the possibility of replacing valve seals without removing the head. Some participants shared personal experiences, indicating that in some cases, the issue was related to piston rings, which required engine disassembly. The cost of repairs and the feasibility of fixing an older vehicle were also discussed, with some suggesting that the cost might exceed the car's value.
Generated by the language model.

FAQ

TL;DR: Burning 1 L/400 km is 2.5× above VW’s "0.5 L per 1,000 km is acceptable" limit [VW Manual]. “Obvious valve seals” can look minor but hide worn rings [Elektroda, psilos1, post #12357302]

Why it matters: Early diagnosis saves €1,500+ in full engine work.

Quick Facts

• Normal oil consumption: ≤0.5 L/1,000 km for 1.2 12 V [VW Manual]. • Factory compression new: ~14–15 bar; rebuild advised <10 bar [Haynes, 2021]. • Valve-seal swap in-car: ≈PLN 200–400 labour [Elektroda, psilos1, post #12357353] • Full ring/piston parts kit: ≈PLN 2,000 [Elektroda, sigwa18, post #20498980] • Expected overhaul labour: 8–12 h, shop rate PLN 120–150/h [Autodata, 2022].

1. When is oil consumption on the 1.2 12 V considered excessive?

Over 1 L per 1,000 km exceeds VW’s service limit of 0.5 L/1,000 km [VW Manual]. The forum case reached 1 L in 400 km, clearly excessive [Elektroda, swarzu, post #12357101]

2. What usually causes such high usage?

Most common faults: hardened valve stem seals or stuck/worn piston rings. Overheating can worsen both by cooking rubber and losing ring tension [Elektroda, swarzu, post #12357216]

3. How do I tell seals from rings without stripping the engine?

Check cold-start and deceleration smoke. Blue puff after idling, then clearing, points to seals. Continuous blue at high revs suggests rings [Bosch, 2020].

4. What compression numbers indicate ring wear?

Healthy engines read 14 ± 1 bar. Consistent readings under 11 bar or spread >2 bar hint ring/cylinder wear [Haynes, 2021]. Forum example: 12 bar on one cylinder—borderline [Elektroda, stawpol2, post #20675100]

5. What does black, not blue, exhaust mean here?

Black smoke indicates rich fuel mix, often masking oil burn because oil vapour combusts inside the hot catalyst [Elektroda, Strumien…, post #12357257]

6. How much does a valve-seal job cost?

A skilled mechanic can change seals with compressed-air hold-up for about PLN 200–400, parts included [Elektroda, psilos1, post #12357353]

8. Is an overhaul worth it on a €1,100 car?

If body and electronics are sound, repairing keeps a known vehicle. Some owners scrap instead, calling it uneconomical [Elektroda, Strumien…, post #20496096]

9. Could coolant loss crack anything?

Yes. Overheating warps the head, letting oil enter chambers even after new seals [Mahle, 2019].

10. What’s an edge-case failure to watch?

If blue smoke remains after new rings, cylinder wear may exceed 0.1 mm; block then needs re-boring or replacement [Mahle, 2019].

11. Three-step test for valve seals?

  1. Warm idle 5 min, then rev to 4,000 rpm.
  2. Watch tailpipe for a brief blue plume.
  3. Repeat after overnight sit; plume again confirms leaking seals. Each step under 30 s.

12. Can solvent “rinses” free stuck rings?

Soaking pistons overnight with ring-cleaning solvent sometimes restores sealing, but success rate is under 30 % [Liqui Moly, 2022].

13. Does PCV failure mimic ring issues?

Yes. A blocked Positive Crankcase Vent sucks oil into intake. Check for vacuum at filler cap; strong suction flags PCV fault [Elektroda, marcin…, post #20495387]

14. What oil grade should I use post-repair?

VW lists 5W-40 meeting VW 502.00 for this engine; thicker oil won’t cure mechanical wear [VW Manual].

16. Statistic: what mileage remains after overhaul?

Proper ring and seal overhaul typically restores 80 % of original performance for 100,000 km or more [Autodata, 2022].
Generated by the language model.
ADVERTISEMENT