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10-11-2016, 10:09 AM
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Registered User
Join Date: May 2012
Location: Colo Springs, CO
Posts: 870
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Re: engine oil - stock 350 using Royal Purple (89 K5)
I've heard that synthetic is probably not the route to go on these older motors. Seals tend to leak more due to the composition of synthetic vs. regular oil. I'd try switching back to regular 10w-30 and see if things improve. I've used Quaker State for many years and mine does not go through that amount of oil. I'm usually about 1 QT per 3000 miles or so.
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- Jeff 89' K5 Blazer, 2.5" lift, 35" tires  04' GMC Yukon XL, 3/4 ton, 8.1L |
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