my sister recently acquired this truck, single cab, 4.2 V6, 43,000 miles. runs excellent, recently changed the oil with VWB 5W20 and a napa gold for cleaning phase, unknown oci history. calls for 5W20, but id rather not use it. So, what would be my best choice out of GC 0W30, Mobil 1 AFE 0W30, Rotella 10W30, or M1 0W40 Euro? truck gets driven 3 miles in the morning to her managers house, where she then rides with him to work, then 3 miles back in the evening. The reason i included the thicker oils is, more often now, Shes been taking it to work, a 25 mile drive one way, and on the return trip it sees speeds of 90-95 mph for a 20 mile stretch (to beat traffic, no shes not crazy, 99% of people who work there drive the same, Port Fourchon, one of the nations largest oil ports) and i figured the ol 4.2 V6 can use all the protection it needs. It calls for 6 quarts but 7 quarts puts it at full. Yall the experts, so what should i run in it?