Can you put synthetic oil in older vehicles with high mileage? I have a 93 C/K 1500 Chevorlet Z 4.3L
10

Asked by Islandguy09 Mar 28, 2014 at 01:59 AM about the 1993 Chevrolet C/K 1500 Cheyenne RWD

Question type: Maintenance & Repair

2 Answers
19,085

Jason answered 10 years ago

i tried it in a 3800 v-6.. 89 Buick riviera. my seals were not designed to hold it in. main bearing seal was moderately leaky. you can blend in a quart with your normal oil to see how it goes. like 1 quart synthetic and 3.5 quarts regular 10w-30.

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