re: Is high milage oil necessary?

quote:

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High mileage oils have extra seal swelling agents that could help some engines with small seal leaks. Problem is once you use them and the seals swell they will wear in to that new size so you are stuck using that oil. If your engine isn't leaking or consuming an inordinate amount of oil then stay away from it.

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Crap - wish I'da knowed this.

Had a quick change company tell me they wouldn't put regular in my 230k+ Suburban earlier this year because of 'liability' and I went with HM because I was already there.

Dammit.