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  1. #21
    S.Prescott
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    Re: OT: synthetic oil drastically reduced oil burning

    That doesn't make sense- I've always been told that Synthetic oil will tend to find bad seals better than conventional- I've always thought, when warm, it thinner than say a 10w30 conv. vs a 10w30 syn, but that it doesn't break down-

    What am I missing- I'd guess a thinner oil would find leaking gaskets... hence not helping engine smoke-



  2. #22
    gunter
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    that is what I though too, hense did the opposite


  3. #23
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    Doesn't make sense...

    by nature, the properties of synthetic oil could never reduce oil consumption; if anything it would only increase. Whether you see it or not, I can almost guarantee you that your engine is burning at least the same amount, if not more, oil.

    Synthetic oil has better lubricating properties which actually have a tendency to burn off more. Generally you'll get more blowby with synthetic, but generally that's a good thing because it's actually coating the cylinder walls more than you would get with synthetic. Valve seals I can't say much for... but again... synthetics have a tendency to be able to get places conventional oils would not.

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  4. #24
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    the car still burn 60% less but to my amazement,

    and how much smoke it used to blow from the exhaust to now no smoke at all is really incredible. And yes it does not make sense to me either but it solve my smoke problem altogether.

  5. #25
    gofast88635
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    Smoke problem solved, thats what counts!!


  6. #26
    Lars Olbimmerguy
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    I am a "Gross Polluter"........

    and my car smokes a bit as well. What was the viscosity of the "dino" oil you were using before. I find that if you use the "book" recommended 20/50 oil, the car does not smoke nearly as much. I wonder if one of three things could have actually occurred in the situation you describe.

    1) Your still using oil, but synthetic burns without visible smoke??? Anyone ever light up a can of synthetic and see if the smoke is visible?

    2) The synthetic cleaned up the ring lands in your pistons, and the rings are sealing better. Now you can dump that ASTRONOMICALLY priced fake oil and go back to reconstituted War Chief (2 gallon can $4.35) and blow just a little smoke.

    3) Uummmm? What were we talking about???

  7. #27
    gunter
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    yes that what I wanted anyway. solved


  8. #28
    gunter
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    UPDATE: another strange good thing that I have

    noticed is that before during accelleration or if I was on low rpm and wanted to accellerate, the valves used to ping like mad, and black or white smoke came out. Now I know that pinging of valves are usually related to low/incorect fuel octane, if we put a higher octane it would reduce or stop valve pinging. of course there are other factor that can assiciate with that too (plugs, dist.cap/wires, ect....)

    Now as I mentioned, I had not changed anything in the engine, did not change my fuel grade. the only thing that was done was put synthetic oil.

    now my valves don't ping anymore. Can anyone explain how come?

  9. #29
    Unregistered
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    no more pinging

    I have been struggling with a car that eats a lot of oil myself. I believe the burning oil effects the fuel mixture in modern cars as the O2 sensors read the gasses and add or remove fuel to compensate.

    I just changed to syntetic but I also added a bottle of motor honey. This is a trick that a old car salesman told me once. I have used synthetic oil in a couple other cars to reduce the smoke (visable at least) & help pass emmissions testing.
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  10. #30
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    Synthetic oil

    My Buick Century 2002 was burning a quart every 2 tank Fulls decided to start using synthetic after 4 tank Fulls no oil burn weird I also was experiencing lots of smoke at startup car has approximately 250,000 no smoke at start up now.
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