I ended up buying one of those vacuum pumps with a 8 quart capacity. It worked great, I just had to run the engine for a little while to warm up the 20/W50 oil, pump it up and let it suck it out through the tube. The boat has a 7 qt Hamburger oil pan with the wingouts on the sides.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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