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With a -65F pour point for the Mobil 1 High Mileage, I'd have no problem using it anywhere short of the arctic. I don't know what the CCS and MRV specs are for it, but they have to be good. The Mobil 1 High Mileage must use an even better base stock than the others.
I agree. I think they are full pao/ester.
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Note 1 -- If your engine has excessive sludge deposits due to less-than-adequate maintenance practices, Mobil 1 High Mileage can help by reducing the sludge left behind by conventional oils. For severe cases of sludge, short oil change intervals (3000 - 5000 miles) are recommended for the first 2-3 oil changes as reduction of the sludge takes place. In cases of engine damage that may have resulted from poor maintenance, even Mobil 1 cannot remedy years of neglect.