Oil additive f350. 7.3 2001
What is best oil additive to add to 7.3 with 171000 miles?
Forum Discussion
I have one of the last 7.3's built with 115K miles. I just change the oil every 5K miles and refill with Motorcraft 15W40. I've tried thinner diesel oil but the fuel injection didn't work quite as well.
From time to time, I'll change the oil in the HPOP. I'll siphon old motor oil through a allen head plug on top of the HPOP. I'll replace it with fresh oil, replace the plug and run the engine a few minutes. I'll repeat the procedure 3-4 times and the last time, I'll put in Prolong instead of motor oil. That's the only non-motor oil that goes into my engine.
From time to time, I'll change the oil in the HPOP. I'll siphon old motor oil through a allen head plug on top of the HPOP. I'll replace it with fresh oil, replace the plug and run the engine a few minutes. I'll repeat the procedure 3-4 times and the last time, I'll put in Prolong instead of motor oil. That's the only non-motor oil that goes into my engine.
