I had me a dodge one time that was like that. I bought some oil system treatment at autozone, poured it in and let her run for a minute, just like it says on the bottle, drained the oil pan, and left the plug out while I poured about 2 gallons of cheap oil through it and washed it out. Then I put some more treatment in with some good oil, ran it for about 1 hr, drained it again and put my regular brand of oil back in and it seemed to work just fine. I did'nt lose oil pressure anymore after that. Taught me to change the damn oil like Daddy and Grandaddy said do in the first place. That sludge can end up costing ya a purty penny.. Kerosene will, "strip" the insides of your engine, I would think. A friend mentioned diesel to me but I went with the oil treatment stuff