I'm about to buy a 97 Ford Ranger with a 4.0L v-6, and 106k miles on it. It calls for 5w-30, and I want to run mobil 1, but, I've read so much on here not too long ago about the mobil 1 5-30 and others shearing rather badly. How would a 0-40 run in my truck? I've read very, very good thigns about the M1 0w-40. Any help would be appreciated. Thanks.