ATF and about 2 qts. Use a 6-point socket or box wrench on the fill and drain plugs - they are magnesium and will round off very easily. Lightly wire brush the threads on the plugs to clean off the old sealant and put some teflon paste on just to fill the threads.
A forum community dedicated to Chevrolet and GMC diesel truck owners and enthusiasts. Come join the discussion about duramax engines, performance, builds, modifications, classifieds, troubleshooting, maintenance, and more!