This won't fix it, but it may help. First put some Seafoam in your crank and run it for a few hard miles. Then change your oil but throw in a quart of Lucas in place of oil. It increase oil pressure and life in my '90 Trooper. I started burning at 30,000 but made it to 120,000 before I swapped out the 2.8 for a 3.4L.