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Originally Posted By: 03cvpi My '99 Z71 5.7 has 220,000, uses no oil and still 50 psi(M1 0w30) of oil pressure,and 16 to 20 MPG.. go GM!!!! Those mpg numbers are AWESOME! esp for a 200k mile engine!

Originally Posted By: beatle78 Originally Posted By: NHSilverado NHSilverado, Can you elaborate? What do you mean by the engines "loved it"? What differences did you notice with the Royal Purple? Thanks, beatle78 Smoother idle and acceleration, less engine noise overall but especially at...

Originally Posted By: NHSilverado I had a 2005 5.3L Silverado and a 2007 NBS Silverado with the 5.3L. I ran both on 5W-30 Royal Purple. The engines loved it. Penzoil Platinum or the new(er) Quaker State Torque Power synthetic would be my second choices. NHSilverado, Can you elaborate? What do...

Originally Posted By: 03cvpi I use Amsoil 0w30 in my 94 GMC 1/2 ton 4wd 5.7L and it seems to work great. Truck has 309k on engine. WOW! over 300K? I love those 5.7L's! Thanks for sharing your input!

p.s. My engine requires 5W-30 oil.

Hi guys, I have spent days reading through posts. Thanks for all the GREAT info! My conclusions are that is seems that different oils do better in different applications. I have a 2003 5.3L Silverado. I'm looking for the best oil for that application. I use the truck as a daily driver on the...