Question about 1985 Porsche 911

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What is the ideal engine oil for 911 1985 Targa

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Well this is always a hot topic and I'm sure you could get at least ten people that would be willing to kill each other over their particular rationalization, but for me, the choice is simple. It has to be a synthetic just because it flows more easily when cold and it has a higher oxidation temperature so the ring lands are less likely to get carboned up and cause oil burning. The brand is not that important to me as long as it is well known. The weight should be something near 10-30w. I personally don't think a few points away from this is going to matter. You will have people tell you that you must follow the manufacturers recommendation to the letter. Well, we're 25 years beyond 1985 and modern oil in this engine is more than adequate in a variety of flavors.

Posted on Oct 04, 2010

  • 2 more comments 
  • 911 doctor Dec 23, 2010

    hi dave944
    have you seen a engine after it was running on regular oil and then was refilled with synthetic?
    It does pretty big damage to it.It works like a send paper .It isway too thin and it creates a lot of oil leaks.
    Synthetic is ok on new engines not for an engine with a milage on it.
    i just thought i would share this with you.
    proporsche

  • Dave  C
    Dave C Dec 30, 2010

    Hi trubka, I don't agree with you, and no, I have never seen any kind of oil behave like sand paper and synthetic oil has a far more stable viscosity at high temperature. That's a scientific fact, but thanks for sharing.

  • 911 doctor Dec 30, 2010

    Hi dave
    you are right about synthetic oils are bether just not for earlier models of Porsche 911.I have had rebuild a lot of engines i pretty much know about what hapened after the synthetic was used...
    but anyway happy new year;-)
    trubka

  • Dave  C
    Dave C Jan 14, 2011

    Trubka, I completely agree when you say: "you are right about synthetic oils are better"

    Dave

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