Some questions about LIQUI MOLY 0W-40 synthetic motor oil and 500SL compatibility - Mercedes-Benz Forum

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post #1 of 2 (permalink) Old 01-12-2010, 01:40 PM Thread Starter
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Date registered: Jun 2009
Vehicle: 1990 500SL
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Some questions about LIQUI MOLY 0W-40 synthetic motor oil and 500SL compatibility

When my 500SL comes out of storage in April, I want the best oil I can get. I bought the car with 24,000 original KM in December of 2008. It has never been winter driven, and never used at all between 1994 and 2009. I currently have 32,000KM, so I am not sure if I should go synthetic. I figure since the car is an antique by modern car standards, it couldn't hurt to go synthetic early into its actual use (the motor is barely broken in, in real terms). I was advised that Liqui Moly makes the best oil for German cars like mine because consumption is less than, say, Agip. Since my 1990 Benz is designed for 10W-30, will there be a problem in compatibility for a modern oil with little to no drag whatsoever (0W-40)? Is my vintage car built for these tolerances, or would a zero W oil cause the motor to run too freely for its own good?
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post #2 of 2 (permalink) Old 01-13-2010, 01:26 AM
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Seems like you're really asking 2 different questions.

First, there's the question of Liqui Moly oils in general. I'm not sure you can find them by that name in North America. We get "Lubro Moly Voll-Synthese" here, which is made by Liqui Moly and is presumably the same stuff they sell in Germany. Voll-Synthese is generally considered top-shelf stuff. It's specifically approved for long-life use in BMWs, Porsches, M-Bs, and VWs.

I believe (though I'm not 100% certain) they use a genuine, full-synthetic formula based on PAO or ester stocks. If that's the case, then I'm not sure Voll-Synthese is really any better than any other motor oil using Group IV or V base stocks, such as Red Line, Amsoil, Elf, or Motul.

Your second question is regarding which grade you should use. It's generally a bad idea to run a thinner grade of oil than that recommended by the manufacturer. If M-B recommends 10W-30, then I certainly would not run 0W-40.

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