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I used to use an extractor on my boats (true inboards, Nautiques) and it worked well given that the drain plug was virtually inaccessible (one had the hose extension but still was a PITA). It was a slow process and I never really felt like I was getting the stuff off the bottom of the oil pan, but there wasn't much choice.
Knowing this, I would never use one on my car because draining it from the pan is so much easier to do. The Boxster is probably one of the easier oil changes because the oil filter is easy to get to.
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