You know the kind of products I'm talking about. Your rational brain
says they can't possibly work, but dump them in and you can't help
feeling they make a little bit of difference. Not enough to
perceive even with the most sensitive of scientific instruments, of
course, but enough to keep you buying like a sucker.
I'm partial to Water Wetter,
which promises to reduce your engine temp by 30 degrees, but which
actually – under real-life circumstances, maybe – cools it down by about 3.
I'm encouraged in my addiction by the fact that my favorite hardcore machine shop actually stocks the stuff.
How about you? What automotive snake oils do you buy?
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