FamilyMann
Been a mechanic for 26 years and years ago a plane mechanic in air force told me about Kano kroil and I have never used nothing different I have unlocked over 10 stuck engines and freed a many rusted bolts .look it up kroil you can now find it on eBay and amazon I have been restoring boats

for the last 5 years and the first thing I do is pull plugs and squirt in kroil and let it sit a day then work the motor by hand .it has been coveted by the air force for years it beats liquid wrench and ever