Got a question for you guys. I have heard that the new M1 5w-40 is rebadged Delvac 1, which is a diesel oil. Now I can't find M1 SUV oil here is western NC, but I have access to Shell Rotella 5w-40 synthetic. My question is would this oil work well in a 2000 Trooper (3.5 liter, 58K) and a 1994 Nissan 4x4 (3.0, 98k)? It gets quite hot here in NC, and I drive quite a bit to PA and AL on the interstate in both vehicles so I like the 40wt. I also change at 3k since both vehicles get mostly short trips (4 miles each way or less). Just want to know the group consensus. I have Havoline 10w-30 in both at the present time.