300B - I had a couple of techs check the valve cover gaskets. Both thought that the amount of oil present didn't account for the amount lost, or for the smoke in the exhaust (occasional puff of blue smoke when starting).
It's an interesting theory though. If it leaks and seeps into the spark plug area/well overnight, you'd see a puff at startup until it burns off and then nothing else.
Perhaps at highway speed, the leak increases under load and the oil drips off the engine onto the highway. Then when stopped/parked, the leaking essentially stops as well and you don't see any on the driveway. 
Seems too good to be true.
__________________
Chris
2007 E550 4Matic - 61,000 Km - Iridium Silver, black leather, Sport package, Premium 2 package
2007 GL450 4Matic - 62,000 Km - Obsidian Black Metallic, black leather, all options
1998 E430 - sold
1989 300E - 333,000 Km - sold
1977 280E - sold
1971 250 - retired
"And a frign hat. They gave me a hat at the annual benefits meeting. I said. how does this benefit me. I dont have anything from the company.. So they gave me a hat." - TheDon
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