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I'm not so sure starting it and warming it is a good idea.I change my oil about every year to year a a half. I don't put on enough miles for that to factor in at all. Rotella 15w40 is my go to with a Wix filter. Fram is well proven to be trash.
Your fresh oil change will be black within two minutes of idling so don't worry about it.
I don't run my M998 in the winter here in Massachusetts because of the huge amount of rock salt we use. I do start her up and warm it to temp every three weeks or so. Just my 0.2 cents.
Mark
Despite the fact that coolant reaches operating temps, without a load on it the internal components don't really get hot. In generators, this practice causes wet stacking.
My MV's also hide from salt over the winter. I put them away with a trickle charger on them and don't touch them again until after the first good spring rain.