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Originally Posted by asawadude
WD40 leaves a oily residue which in turn becomes a dirt magnet. If you wipe it, whatever's left will likely vaporize from engine heat. I think WD40 is rather pointless as a protectorant; it's value is only as lubricant.
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Actually, WD40 is a protector from corrosion, not a lubricant at all. WD40 was originally developed in the 1950's for the military as a Water Displacement (the WD name) technique to displace water and prevent corrosion on metal parts. Keep in mind that WD40 is not a lubricant, never was designed to be, never will be. I agree with asawadude, based on the residue that it will leave behind, I would not spray it under the hood. In any event, why mess with the corrosion protection that BMW has already engineered into our vehicles??? 
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