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Originally Posted by jonathan180iq
Changed over to Mobil1 10-40 automotive high-mileage oil. This stuff claims to have anti-wear additives but does not contain any energy conserving additives.
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I think you should read up on "high-mileage" oils a bit more.
It is indeed good stuff for an OLD engine; cut the oil use about 1/2 in my old pickup truck
BUT........
One of the things it does is swell the valve guide seals more than "normal" to make up for wear there.
That would concern me in a "not-old" engine. I'd be afraid that it would make valve guide seals that are NOT worn much to tighten up and wear faster.
Disclaimer: I am NOT an automotive or oil engineer. This is my guess only (not even an opinion, really) and may be entirely wrong. Just a heads up.