6.4L Power Stroke Engine and DrivetrainDiscussion of the 6.4L Power Stroke diesel engine and drivetrain in the 2008 Super-Duty trucks. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 6.4L Power Stroke engine.
I'm confused, is it 5,000 mi or 11,000 mi on the oil sample in question? If it's 11,000 mi and you're up over 5% fuel, why don't you just change on the 5,000 mi severe duty schedule where fuel dilution is >2% and not a big deal?
Ford says 10000 mi. I don't consider it severe. Most of the time I'm running light back and forth to work.
Dealer says the fuel is getting in there from idling and regens. Oaradoxical huh? You haver to idle it to cool it down because regen makes it run at 1200 friggen degrees.
__________________
New Truck
2008 F450 CC Lariat White/Gold, JAD Solutions Lights, 62 Gal Titan, B&W Hitch, Ford Gold Remote Start, TruckTrunk box, Viair 550+2x2.5gal receiver
I have a 2002 7.3 F350. The only time I have had excessive fuel in the oil in the truck or my tractor is from excessive idling. The one time I had it in the truck I was driving on a route that would leave me stuck in traffic for 30-45 minutes to go 3-5 miles. Once I was able to avoid that mess I no longer had fuel in the oil.
You just have to change the oil if you are idling too much. What was surprising to me was how little idling compared to driving time would get fuel in the oil. Out of 650ish miles on a tank of fuel only 50 would be in stop and go traffic but that was enough to get fuel in the oil.
Most of the time I don't need to run my tractor at PTO speed but I don't run it at idle either. I still had some fuel in the oil. So I just bumped up the RPMS and that was enough to solve the problem. Can't really do that on the truck.
My question is this - to Ford. You have this engine so bottled up on backpressure that it runs hot all the time - especially in hot weather. You want us to shut it off after it cools down to 300F. Mine never goes down that far in the summer with AC on - might get to 325F after 7-10 minutes. You also recommend 10000 miles oil change intervals.
What testing done by Ford yielded the 10000 miles recommended because obviously us owners don't know what we're doing?
__________________
New Truck
2008 F450 CC Lariat White/Gold, JAD Solutions Lights, 62 Gal Titan, B&W Hitch, Ford Gold Remote Start, TruckTrunk box, Viair 550+2x2.5gal receiver
The AutoGuide.com network consists of the largest network of enthusiast-owned enthusiast-operated automotive communities.
AutoGuide.com provides the latest car reviews, auto show coverage, new car prices, and automotive news. The AutoGuide network operates more than 100 automotive forums where our users consult peers for shopping information and advice, and share opinions as a community.
Once I was able to avoid that mess I no longer had fuel in the oil. 
Linear Mode
