Thread: synthetic in a high mileage YJ
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Old 03-08-2007, 09:44 AM
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synthetic in a high mileage YJ
I'm sure this has been brought up before, i remember reading it but I cant find the thread. I hav a 93 YJ with 130,000 miles been using Penzoil high mileage oil for 5 yrs, was thinking about switching to Mobil 1 Syn. Will this help or hurt my 4 banger?

Nick
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