I first bought a Slick 50 in 1989. I had an old 1976 Ford F100 with a 302 engine that had 3 pounds of oil pressure at 55 mph. I've tried replacing the oil pump and main bearings to increase oil pressure but to no avail. I bet on Slick 50 because I thought it was cheap insurance. I built another engine to replace the old 302. I drove this tired motor for another 6 months. When it came time to swap out the old slick treated '50 engine, I drained the oil and started it. I did the last things with the new engine and let it run for about 20 minutes. It hadn't clogged yet, so I drained the antifreeze and let it run for another half hour. It still wasn't locked. I grabbed the throttle and left the engine wide open for another 10 minutes. The old motor still hasn't exploded, stalled or missed a hit. In the end I turned off the ignition. After the motor had cooled down, I removed it and installed a new motor. After breaking this engine in, I also treated it with Slick 50. I disassembled the old engine and found nothing out of the ordinary. No glasses, no Mark's glasses, nothing! I bought Slick 50 and have been using it for many years. I am an ASE certified truck technician and have recommended it to many people over the years. I use it in every engine I own. Hope this helps someone in their purchasing decision.
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