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So how hard would it be for me to drain ALL of the coolant and refill it with the BMW stuff? When we did the t-stat replacement, we didn't drain the block, so right now there's just an amalgamation of fluids in there - old BMW coolant, new Prestone coolant, and DI water. I really don't want to have to take it to someone; that's the whole reason I did it myself. I guess I should have researched the coolant issue beforehand.
Edit: After some research, it looks like I just have to pull the radiator plug and the plugs on both sides of the block and refill 50/50 with coolant/water. I need 6.5 quarts of coolant since we have a 13 quart capacity, right?
Last edited by Bimmerbear; 27th October 2009 at 06:36 PM.