Synthetic motor oil and ATF both work well, and both have their own pros and cons. For the best of both worlds, I prefer the Ed's Red Lubricant. 2 parts synthetic motor oil (the lighter weight, the better), 2 parts ATF, and 1 part STP oil treatment. The STP is there really just to help keep it where you put it. I've been using this recipe for several years with excellent results.
I have been using VHinch's mix as well with excellent results. Speaking of which I am running low my good friend.
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