Vent: I was flipping through a 1950s shop manual and saw they used to temper springs in used motor oil

Found this old book at a garage sale in Boise, and it said they'd quench coil springs in drained crankcase oil to get a specific blue temper color. I tried it on a small leaf spring last week and it actually worked way better than my usual canola oil. Has anyone else used old automotive fluids for tempering, or is that just a weird old-timer trick?

2 comments

2 Comments

grace9267d ago

Wow, that's actually quenching, not tempering.

sarah_johnson467d ago

Honestly, always thought they were the same thing. Tbh, @grace926, your post actually made me look it up and you're totally right. Ngl, my mind is a little blown.