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Old 03-14-2019, 11:40 AM   #10
Senior Member
Join Date: May 2010
Location: so cal, placerville, vegas
Posts: 1,115
Default Re: Stuck Piston Rings

MOC.... that was the name on the can. I think it stood for Motor Oil Conditioner, but I'm not sure of that. It's been a long time. I was introduced to it in the late 50's, when there were several (new) ohv engines, and oil at that time was much different than today (detergent, what's that?). My take, I think it was a very aggressive solvent. When I first saw it used, the service manager at the dealership where I worked, identified a noisy rocker on a engine, and directly squirted the MOC on the pushrod, letting it run down to the lifter (engine running). That sucker quieted down, almost instantly. I was impressed. And, I had a few opportunities to repeat that 'fix'.
I went looking for this stuff, both MOC and Rislone, more recently, 3 or 4 years ago. I came up empty.
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