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Ever since I've owned my '88 Escort I've used a quart of Slick 50 or simular product in it every 50K miles and it currently has 486K miles on the original engine with no engine related problems. I use it in all my cars. I've been using FP+ and LC-20 for about the last 6 months or so in it too, but I haven't noticed any improvement in FE. I can tell that the LC-20 is slowly cleaning deposits off of the rocker arms just by looking through the oil fill cap.
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