I have some Mobil 1 75-90 and some Mobil 1 75-140. Can I mix them half and half? I would think so since they are both Mobil 1 products but wanted others thoughts. Would it be like a 75-115 in weight?
I mixed them just fine on two of our vehicles two summers ago. One's at 15K the other approaching 27K. Same brands and weights as you have mentioned. Both separate occasions I was just trying to get rid of some leftover 140.