I have 2 now. A 91 F150 302 4x4 with a 4 spd. It has 204k on it. It had the dealer re-ring job at 45k...excessive oil consumption...rings never sealed they said. The last 159k it has had Pennzoil dino changed at 6-8k intervals with the last 3-5 changes using Castrol Syntec. Filters used were...