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Old 09-21-2021, 09:13 AM   #15
LT7A
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Join Date: Oct 2015
Location: PNW
Posts: 3,528
Re: 1972 C30 Dump truck

It's all headed in the right direction! Always cool to save something like that and move it toward usability. I would use up a can of penetrating oil in those cylinders first. Let it do what it's designed to do. And then a 50/50 mix of motor oil and transmission fluid is what I've had recommended to me and used in the past. The cleaning agents in the transmission fluid go to work for you, and the oil is obviously there to lubricate. Good luck!
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