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I tried slick 50 once when it first came out on my 63 t-bird. No real improvement in fuel economy or power. Looking at the stuff as I poured it in I could see the teflon as a sort of sludge in the bottom of the container that didn't want to pour out. It was then that I read the shake well before use on the label. No big deal I poured some oil in the bottle and shook it up and got it out. Of course I'm sure that the stuff just settled some place in my engine.
Synthetics are a better way to go IMHO. They don't have particles to settle
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