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My tech friend intruduced me to a combo of used oil and tranny fluid. Mix it together and put it in an industrial spray bottle. Spray it all over the undercarriage, wheel wells, engine bay etc. I have been doing it for three yrs on my neon and rx7 and no rust at all. It soaks into the metal and forms a thick coating. It will even recondition rusty metal. And best of all its free and just takes the effort of getting under there and spraying.
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