Join Date: Apr 1999
Location: Chugiak Alaska
Feedback Score: 0 reviews
Your problem is real but not common. it pops up on the forum once or twice a year. I don't think it is a back pressure issue. I had back pressure delete it not help when I had this issue with my truck. I have never found the root cause, even had KLHANSON look at it!! I went to Different Strokes in Anchorage and talked to the owner Ron. Great guy (every town should have a Ron) he could have said bring it in and we will work on it, but, he said just run lighter oil in the winter. It solved the problem 100 % I started running 10w-30 Rotillia year round and it solved the problem. It is a oil temp/viscosity issue, that is why it gets better when warm or preheated. Before you start throwing parts run a light weight oil like Rotilla 10w-30 and see if that helps. If it works you are done. If you want to be the one that has the final answer to this issue consider looking at the low pressure oil pump. I just did not have the time to do it before I sold the tuck. Do you run 15w-40 oil now?
Early 1999 F350 AUTO 4x4 CC LB DRW 4.10 6.0 trans cooler, Front hitch, 2,000 hubs/ brakes, Bilstein shocks/steering stabilizer, Diesel site coolant filter 203 thermostat, EBV delete, new O-rings, new Oil cooler, RIFF RAFF FRX, Glow plug led, Pillar gauges, Lighted cupholder, Painless wiring fuze block, Harpoon/hutch mods, Removed axle blocks. Air bags, 5 wheel hitch, In bed 7 pin plug. Spare tire key delete. KLHANSEN on speed dial. 75,000 as of May 2019