[Hoop]

'That would mean using a straight weight non-detergent oil ad Henry did. If the engine is older running a detergent oil could cause you some problems."

Kube, you think that's the best advice? So-called "straight weight" is killing your engine on cold starts.

I explained that "weight" is an incorrect term ... it's GRADE when you are talking about viscosity. Oil is not labeled by "weight."

Not sure what your point is on the 0W50, but if you are saying that the "ZERO" means it is a really thin oil, you need to reread my earlier post. What Mercedes is saying is that it requires 50 Grade oil at operating temperature ... and wants to prevent that 50 GRADE from getting any THICKER when the engine is started cold with cold oil.

No matter what one's opinion is, using the correct terms and understanding what multi-grade oil really is helps the discussion.

Many folks completely misunderstand multi-grade oil. If an engine runs best on a certain GRADE oil at operating temps, then it will run best cold on the same GRADE. The problem that oil companies have solved is that straight GRADE oils are thicker when cold and the GRADE changes. Modern oils attempt to maintain the same viscosity through a temperature range from cold starts to operating temps.


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