Sorry for the slightly trollish title but I was just thinking. Been running mostly 5w20 in my truck although sometimes I will go with 0w20 in the colder months. Approaching 100k and I do burn about 1qt every 3k miles. Running M1 most of the time and she is smooth and quiet. I have seen a ton of discussion on the truck forums and many people run xw30 in these trucks. Pretty much the same engine as the Boss which specs 5w50. Would there be any benefit to bumping to a 0w30 or 0w40 over my M1 5w20? I'm not thinking the cold performance would be a factor as I'm already plenty covered with the synthetic 5w in my locale but what about running at full temp on the highway or even light duty towing?