Question for you four stroke guys

[cterrebonne]

i can give you first hand experience with this. i used to maintain a fleet of 6 cats for an drilling company through a dealership and they kept haveing break downs due to engine oil not holding up under the extreme conditions. after testing many different types of oils and then sending the oil samples to a chevron lab to get analyzed and then sending the info back to merc engineers the mobil 1 full syn was the best hands down.