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The Owners Manual says to add an extra quart of oil at the track and then to remove it when finished autocross/track driving. What's the best way to remove the oil? Is it possible to take a quart from the oilpan without draining too much?
Remove the oil filter and that will get you at least 1/2 quart out. It will be kind of messy. Thought I had read in the past that GM said it was ok to leave whatever was over the full line in.
You may want to ask in the autocross/roadrace section. Those guys seem to know their stuff.