Regarding Militec-1, I've said it once, and I'll say it again, this stuff works (Sachelles' problems with it noted). My "once every two years" rebuild of my auto tranny are a thing of the past. Also have it in my diffs (in my q), crankcase, hydraulic reservoir, and A/C system (replaced the lube oil with it). Brian '86 5000 turbo (170k) '89 200 quattro (130 k)