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Old 03-11-2009, 01:14 AM
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Originally Posted by ForcedInduction View Post
It goes along the same lines as "pick one oil and stick with it."

Mixing won't kill the engine but its not good for it.
So far I'm seeing some "phrases." Can anyone point to any information to back up these opinions? How about something from an oil company or additive manufacturer (like Lubrizol) stating that there are incompatibilities? Or maybe the American Petroleum Institute (The ones that do that API SG/CD stuff...)

In fact, my opinion (and it is only an opinion) is that the API would demand that all oils that meet the specification be fully interchangeable and have no adverse interactions if mixed.

Would I mix oils intentionally? No. Nor would I fret for a moment about mixing them.
1987 W201 190D
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Old 03-11-2009, 01:29 AM
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Originally Posted by JonL View Post
API would demand that all oils that meet the specification be fully interchangeable and have no adverse interactions if mixed.
There is no such requirement. API only tests to define, certify, and monitor engine oil performance deemed necessary for satisfactory equipment life and performance by vehicle and engine manufacturers.
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Old 03-11-2009, 01:33 AM
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Originally Posted by ForcedInduction View Post
Don't even bother with a 1/2 quart. The engines usually run better and consume/leak less oil when its about half way between the two dipstick marks.
In 2-3 years of owning my 300cd I have just figured this out. If I have the dipstick showing at half it doesn't leak or burn any more oil but closer to the full level it would.
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Old 03-11-2009, 12:33 PM
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Originally Posted by Icefire View Post
The additives in different oils will interfere with each other.
If that were true, we'd never be able to switch oils. There's always some left-over oil after an oil change, especially in the oil cooler. If you look at some oil analyses, you'll see all oils are basically composed of the same elements in various concentrations. There are no magical or alien components.
2004 VW Jetta TDI (manual)

Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL
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Old 03-11-2009, 01:00 PM
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They are compatible.

However, mixing two different oils will not necessarily give you all of the properties of either, so you could degrade the performance somewhat. Not enough to be a concern, but why not get the best protection and stick with one oil when practical.

Of all of my Mercedes, 103/104/602/603, I have never had one that consumed any significant amount of oil, and I always fill to the upper (full) line. Perhaps some of the older cars are different, but I have not found this to be true with these.

Same legend surrounds a Caterpillar engine of which I have owned 7, never found it to be true there either.

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- Jeff
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