Quote:
Originally Posted by CincyJohn
As for the extractor, it's not about the amount of oil. It's about sucking oil through a tube that engineers didn't design oil to be sucked out of. If nothing else, I don't like the idea of coating the entire inside of the oil pan/sump and everything else with the used contaminated oil when I can drain it through the bottom as it was designed to leaving whatever particles might be in the oil at the bottom of the pan. Also, having being an engineer, I am always leery of placing any kind of pressure or vacuum on a system that wasn't designed for that.
And yes, I don't like people I don't know and trust driving my car at anytime for any reason (one of many, many reasons I don't like/use valets - ever).
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What are you talking about? Oil extractors are the default oil drain process for Benzes, has been for literal DECADES. A Benz's engine/sump design is not in any way different than anyone else's to accommodate the extractor. Since then VW/Audi do too and a lot of BMW did before they removed the dipsticks. It works just fine, the only reason othershops don't do it is that the extractors and their maintenance cost more than a dumb wrench and crush washer.