Ford Mustang Forum - View Single Post - Which Synthetic Oil?
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post #16 of (permalink) Old 03-08-2011
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Originally Posted by robb15033 View Post
You can switch to synthetic at anytime as long as there are no leaks.
Mobil1~Royal Purple~Pennzoil Ultra
Go to "the oil guy" web site and do some research. These three perform 7500+ miles per oil change. Its cheaper in the long run and better protection.
Are those the only three that lasted that long? What about valvoline?

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