i recently had the oil filter on my 4.7 loosen off out in the middle of nowwhere and had to use 15-40 diesel oil that a very nice trucker had in his rig i was wondering if it would be harmful to my engine i ran it for about 250k before i changed it
I ran royal purple 15w-40 HD in mine for 3000-4000 miles. No knocking. Theoretically with the extra detergents that diesel motor oil has it could cause oil leaks. If a build up had it sealed off and the high detergent oil broke down the build up.
Ratmonkey is correct, the cam followers and hydraulic lash adjusters do not like oil that thick, you will develop a tick from either or both heads due to lack of oiling. Bearing clearances are set to run a specific weight and viscosity oil, start changing and mixing and what not, that's how knocks happen. The number 8rod bearing being most common as I have found in the 4.7s. It's fine to limp you home, but I would never run it 5k every oil change. I run motorcrafts semi synthetic blend of 5w30, works great.
Built Beater 01 WJ MY BUILD THREAD
Swapped, SUPERCHARGED Locked, Lifted and Long Armed.
02 Cummins. It has a smoking problem, And it wont quit.
K8 GSXR 1000- Racefit,Comp Werks,Puig,Woodcraft,B2 Industries,55W HID'S, R&G Engineering, Two brothers, ASV, DDM, "The pantie dropper"