What oil does a 4.3 vortec like the best?

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I have no idea of how to judge what and an engine "likes". I've been using PYB 5w-30 since new ('03 GMC Safari) and switched over to PP 5w-30 at 115k. No worries.
 
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Originally Posted By: addyguy
PYB 5w-30 or 10w-30 would be a great choice...this engine seems to like the high moly. JMO....
I have a 4.3 Vortec in my Trailblazer, and it runs so freakin' smooth on 5-30 PYB.
 

CJE

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I just replaced a 2005 4.3 at 176,000 miles. I am the second owner and I knew the meticulous first owner. He had lost an oil pump and a timing chain during his tenure. For a good while it had a broken or weak valve spring that would dramatically limit the performance at 94 mph. Various other operating issues, low -ish compression all around and finally #6 showed 10-12 psi compression. I pulled the plug at that point and replaced the original engine with a $500. used engine from a yard I trust. So apparently there is at least one which refused to run forever. The rest of the truck is nice but the original 4.3 engine wasn't quite up to par somehow. CJE ----------
Originally Posted by 901Memphis
I think the 4.3 is the exception, it runs forever on anything, any flavor. I don't think i have seen one of these engines that didn't outlast the rest of the truck. I think recommending any API SN 5w30 is appropriate.
 
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