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I use Valvoline Synpower 5w-30 in all of my vehicles. I have experimented with Motorcrafts syn-blend, but a 4,000 mile OCI UOA reported a low TBN and some shearing.

Ive run the synthetic Valvoline out to 8,000 miles in my 2002 Envoy (7 quart sump), and the UOA reported a good amount of additives still available not to mention no shearing. Its usually on sale up at Murrays for $.99 after rebate or BOGO at Advance Auto.
 
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