This test demonstrated that not all penetrating oils are equal. Also, paying more doesn't result in better performance. In this showdown, ATF/Acetone mix, AeroKroil, Liquid Wrench, PB Blaster, Royal Purple and WD-40 are put to the test. Results: Liquid Wrench came out on top, following by ATF/Acetone, Royal Purple, WD-40, PB Blaster, and AeroKroil.