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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.
Lucas Oil stabilizer is the best thing to use. (In my experience)

Conventional oil and Lucas has been my choice all the way to 380K miles on my 5.7L vortec.
 
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