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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 synthetic or regular oil, the dealer said they use Mobil regular on their oil changes.
 

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i run mobil 1 syn 10-30 and lucas syn oil treatment in my trucks. when i got my 95 2500 it had 163,000 miles on it, since i started running the lucas it seems to be running a little better and it also help a little oil leak i had.
 

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Synthetic oil

I am now exclusively using Valvoline Synpower oil in all my engines. I have used Pro-Blend products since the mid 70's. Their engine and differential oil treatments are the best. Back in the day we raced a B-gas dragster and if we experienced tire hop off the line the ring and pinion were toast! After using Pro-Blend's trans/diff additive we never lost a ring and pinion again.
 
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