Liquid Wrench L112-12PK Penetrating Oil (12/11Oz)

Never fails to help crack loose stubborn nuts, bolts, screws, spark plugs, and helps get in to lubricate tight tolerances.

I like this best for rusty bolts etc.

Liquid wrench is a good alternative to WD40. and tends to be less expensive.

This is the best penetrating oil I have used. I sprayed it on a sway bar bolt one night then next day went out and the bolt came right off. And I could see that the oil made is way too all the threads.

seems to work as well as kroil, or wd40, in spray can, large enough to get several jobs done. even give a can to a helper, with 12 cans.