One thing to remember about this idling issue just mentioned: some engines are designed such that the cam shaft lobes are lubricated by oil that is slung from the crankshaft. This is true in the Chevy Small Block, as well as other similar OHV configured engines. What this means is that a Small Block idling at under 2000 RPMs is NOT lubing the cam lobes very well, so should never be run this way for any length of time. On the other hand, I'm not sure how the MB overhead cam lobes are lubed, but I suspect this isn't an issue.


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Steve
1979 240D
1990 300E