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Hey does anyone know if engine oil treatments like petro tech or slick 50 do any good to prolong the longevity of my motor. I just turned over 90,000 on my 2001 Silverado Z71, and want to keep it as long as I can. Also what do you guys know about using synthentic oil or regular. The dealer said they use regular Mobil oil in their oil changes.
Add a quart of Lucus oil treatment at oil change S t p will put a glaze on rod and crank bearings
 
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