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Re: What's Different in High-Mileage Oil?
Posted to Castrol Forum on 5/15/2018 1 Reply

My oil previous oil rep who works for a distributor for shell/Pennzoil and sister brands told me there are different additives depending on what company is marketing it. The primary difference is a seal swelling agent that all formulas have in it. In the short... Login to read more.

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