Originally Posted By: Panzerman
Straight 40HD. OMG, do you pour it in or have to clump it in with a spoon?? This is all we used for years in Detroit Diesels which were exposed to way, way below zero. They had block heaters, but on a lot of them they only heated the coolant, not the oil. So it sat cold and dormant in oil pan. Seriously, this thin oil craze is out of hand.
I've heard/read stories about guys putting charcoal in a pan, lighting it, & sliding it underneath oil pans on DD 2 stroke diesels to get them warm enough to start in subzero weather! In hot weather, in a CR diesel, I can't see where a SAE 40 HDEO would hurt anything. At -20F, don't think it's going to start very well.