So, I was bored and decided to do a little test. I took a small pan and put it on the side burner of the grill. Got it nice and hot. Poured some deere plus50II SM cj4 15w40 (Dino) on one half of the hot pan, and some SN PU 5w30 on other half. Well the 15w40 burned up and actually caught on fire, leaving a black spot of burnt oil. The PU didnt catch on fire and it stayed in oil form the whole time, no flames and stayed realitivly clean. So there.