High mileage oil change 10w30 or 10w40?

dimanche 26 octobre 2014

I just bought a 95 ZJ 4.0 with 255K on it. The PO always used Pennzoil High mileage oil in 5w30. In all my cars I use 5or10w40. Would switching to a w40 oil at 255K help or hurt the engine with such high mileage?




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