Quote:
Originally Posted by cast_and_blast
Won't hurt anything but your pocketbook.
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Probably won't help anything either if you are running 0W-20 synthetic. It you are not, then do it. The thermal characteristics already fight heat and you don't need to mess with additives. The change from 5W-20 to 0W-20 synthetic will improve your FE and unless you live somewhere exceptionally hot (Arizona, NM, etc. no foul on engine wear.