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Best oil for S52?

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  • #16
    My S50B32 doesn't burn any oil at all and that has both "increased output" and "maximum engine speed" than the S52. The reasons that manual text above ^ provides are pure BS.

    Oil is easy, it's only subjectivity that makes it seem complicated:
    • Use a quality brand of full synthetic oil
    • Use the thinnest operating temp weight (the last number on the oil) you can, your climate and driving demands determine this
    • Use a winter weight suitable for your climate and, unless you live in the north of Canada, that's going to be a 5w, 10w or even 20w oil
    • Minimise the gap between the two viscosities, i.e. if it's suitable for your climate and driving demands a 15w40 will be better than a 5w40 (all other things being equal)
    And the only rule that breaks this formula is if the manufacturer recommends or mandates a specific viscosity (hello S54) and in that case, always listen to the manufacturer.

    Even a regional handbook that spans multiple climates won't have the ideal spec for each of the climates.

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    • #17
      Motul 8100 5w40

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      • #18
        Originally posted by M3AN View Post
        My S50B32 doesn't burn any oil at all and that has both "increased output" and "maximum engine speed" than the S52. The reasons that manual text above ^ provides are pure BS.

        Oil is easy, it's only subjectivity that makes it seem complicated:
        • Use a quality brand of full synthetic oil
        • Use the thinnest operating temp weight (the last number on the oil) you can, your climate and driving demands determine this
        • Use a winter weight suitable for your climate and, unless you live in the north of Canada, that's going to be a 5w, 10w or even 20w oil
        • Minimise the gap between the two viscosities, i.e. if it's suitable for your climate and driving demands a 15w40 will be better than a 5w40 (all other things being equal)
        And the only rule that breaks this formula is if the manufacturer recommends or mandates a specific viscosity (hello S54) and in that case, always listen to the manufacturer.

        Even a regional handbook that spans multiple climates won't have the ideal spec for each of the climates.
        That is a good general set of rules.

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        • #19
          Liqui Moly 5w40 from FcpEuro here and have 0 complaints

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          • Bimmerboy93
            Bimmerboy93 commented
            Editing a comment
            That's what I decided to use.

        • #20
          The correct Mobil 1 oil is to use in the S52 engine is 0W40. It is the only one sanctioned for use by BMW long life 01 standard. It is not one of the Extended

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          • #21
            Originally posted by James Williams View Post
            The correct Mobil 1 oil is to use in the S52 engine is 0W40. It is the only one sanctioned for use by BMW long life 01 standard. It is not one of the Extended
            Really?

            I'm pretty sure sensible oil change intervals, rather than "long life" cons, were the most prevalent in the 90's. It seems quite unlikely to me that BMW have retrospectively changed their oil mandates this far down the track. And a 0w40 is unlikely to be optimal unless you have special requirements.

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            • #22
              I think there are several high quality oils available. What you use likely depends on several factors including climate, engine miles, availability, use and budget.
              Oil threads (and there have been many) always produce a ton of opinions.
              Joe's 1998 M3 Journal

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