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Re: Oil filter in the oil pan?
There were a fair number of GM cars that used a cartridge oil filter. They were a real mess to change. There was a large gasketed plug that was about 4 inches in diameter threaded into the bottom of the engine. You'd have to use a socket wrench with a 21 or 24 mm socket (don't remember which) to loosen the plug, oil would start to drain. The plug was completely horizontal, so it was impossible to not get oil on your arm and socket wrench. Once the oil stopped draining, then you'd grab the little tab on the filter cartridge with a bull-nose pliers and twist it back and forth until it unseated the rubber seal, then more oil would dump out all over your arm and pliers. I hated those things.
-Rod
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