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My first job right out of tech school was at a dealership that carried Porsche.
The way I change my own oil to to put it on the lift right after a ride. Pull the plug and filter and let it drain overnight. Inspect the filter pleats for contamination. The next day add a new quality filter and 9 quarts oil. 9 quarts is spot on on my 986S. You'd be surprised how much extra oil will drip out by leaving it overnight vs 5 to 10 minutes. Most lube racks do not let it drip long enough. Time is money.
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