I would use the Mobil dino in your case with the two that you listed. The Mobil has mush better cold weather specs that would be more useful in IL. The Castrol pumps at 3100 @ -25f, and has a pour point of -27f. Not good. Mobil dino has 5500 @ -30f.
quote:Based on virgin analysis, the Valvoline dino oils look to have a very very weak additive package. I don't think they are very good personally.
Originally posted by eldawg4100: the quik lube guy today told me the dino oil was valvoline... havent heard the best stuff about it... ive ran MMO in all my previous cars... helped them run a LOT better in some cases... so, what do you all think of valvoline dino oil?
quote:Big mistake (IMHO). There is really no good reason to use it. It probably has some AW properties but you will be running with something less than a 30 wt. And who knows how it will affect the carefully designed additive package with your present oil. I do use it in my gas every now and then and I am violating my own principles. But I feel it adds a little lube to the gas to protect the piston area a little better. I do know it increases my gas milage.
Originally posted by eldawg4100: ive ran MMO in all my previous cars... ?