Supreme 9000 SAE 5W-40 Diesel Oil in gas Engine?

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Dec 20, 2003
Folks, I'm kind of a newbie here so be gentle, please.

I have a 1992 MB 300CE with the M104 inline 6 CIS-E engine. I had been using the Supreme 7000 20W-50 Racing with good results.

I purchased some Schaeffer Supreme 9000 SAE 5W-40 on the advice of a friend. This is labeled as a Diesel oil.

Should I have ordered the 9000 5W-50 Racing oil instead?

Will the 9000 Diesel oil harm anything in the gas engine, like the catalytic converter?

Does the term 'Racing oil' imply that I should not use it in a daily driver and run 7,500 to 10,000 mile change intervals?

Thanks for any enlightenment!
It is for use in diesel engines, but it also is certified for use in gasoline engines. It likely is API SL certified for use in gasoline motors. Have no worry; in fact, I'd say that is about one of the best choices you could have made for your old Benz. No need to run 20w-50.

Search in the Used Oil analysis section, there is at least one report of this oil in a Nissan Sentra.
As Drew said


The Supreme racing oil appears to even meet SM specs

t meets and exceeds the following specifications and manufacturers’ requirements: MIL-PRE- 46152E, CID A-A-52039B, API Service Classification SM/CF, Ford M2C153-G, ESR-M2C127-B, ESR-M2C179A, SSM 29011-A, General Motors, ACEA A1/B1-04 A3/B4-04; Daimler Chrysler 229.1, 229.3, and MS9767; Mercedes Benz MB226.5, JASO JIS K2215 and VTW, Porsche and BMW specifications, and Volkswagen 501.01/505.00
Racing oil usually is designed to take lot's of fuel dilution. I would stay away from it in a car engine. In a drag type car the 20-50 or straight 60 wt works well because the gas/alcohol/or other fuel dilutes the oil quicker than a normal engine. If it is a race only oil, it might not have the dispersants and detergents to keep a street engine from sludging also.

You have make a wise choice with the 5-40 diesel/gas oil! Now, run that out to about 12K and do an oil analysis.

[ May 06, 2006, 02:33 PM: Message edited by: LargeCarMan ]
#9000 5W-40 is working fine in my gasoline Volvo turbo. I have one good analysis at 5000 miles and will get another at 10k.

Look at the label on any oil called "racing." If it has all the industry specs, OK. If not, it might be real race oil which needs to be changed after each race.

Thank you all for your responses. I will rest easier now. I was afraid that maybe the additive package in an oil made specifically for a diesel engine may have components that would shorten the life of a cat.

Thank you.
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