He drives quite a bit, maybe 17k a year. He is at the end of his 2nd 5,000 mile dino change, DIY. Even though we are in the Northeast, I am going to buy him a jug of 10w-30 M1 because it seems the most stable Mobil 1. Flow/pumpability is ok, ya? It goes down to 0 degrees for a dew days a few times a winter. He needs to keep it simple, no fancy-boy oils. We already discussed the filters, a stack of Totota filters await an oil decision. I like Rotella, but want to keep it simple for him. M1 10w-30 7500 mile changes. Does this sound good? Would 5w-30 be *much* better in winter? Is switching back and forth seasonally a good idea? He probally drives it hard.