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Originally Posted by 250rr
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That oil (15W-50 Mobil 1) isn't a standard auto oil, so it does have higher levels. The only 10W-40 auto oil that Mobil 1 lists (
https://mobiloil.com/~/media/amer/us...pecs-guide.pdf) is "High Mileage", and it also has more than standard levels - but it still isn't a better choice than Rotella T6.
Running a 15W-50 isn't a great idea if the engine isn't designed for it. 15W is WAY too heavy for anything resembling cold temps, and 50 is not a great choice for engines that recommend 40. Heavier oil moves slower and carries heat away slower. Heavy oil also builds more oil pressure that necessary. Heavier oil is not better, with the possible exception of a Big Twin running a conventional oil...in the middle of summer...stuck in traffic...
Just run Rotella T6 and call it a day.