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While we're on the topic of oil, I've always had a question. Do you have to put any extra oil in to accomodate for the turbo?
It should need enough extra to fill the volume in the turbo and feed/return lines. Just fill it to the mark on the dipstick. As for Castrol GTX, that is what I'm using now, but after everything is installed I plan to run full synthetic. Should hold up better under the higher heat, and i don't want to take chances.