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Re: high mileage oil
The high milleage oil has some chemical compounds who in contact with the gaskets ,,swells" them helping to seal small gasket leaks the most common reason, they do not fix mechanical issues.
Also the oil has a higher ,,flash" point that being the point where the oil starts to burn.
Thats about it the rest of what you read on the quart is nothing more than marketing crap.
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