re: Is high milage oil necessary?

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.if you decide that you have to do something, just go to a heavier weight of oil...but that shouldn't be necessary either...

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This, due to wear it may be better down the road to bump up the viscosity a bit.

High mileage oils just have seal agents and more detergents, which are irrelevant if you've kept your engine clean throughout it's life and used quality gasoline.