Join Date: Aug 1999
Location: Kaysville UT USA
Feedback Score: 0 reviews
1st off you can't compare the old 7.3L diesel engines to any of the newer engines. It's didn't have an EGR and you were not recycling exhaust gas back into the engine.
When these 6.7L engines first came out in 2010. A Ford engineer was online discussing the new engine. He commented that they had run beta test trucks and been successful at over 10,000 mile intervals for oil changes. The 2011 trucks carried a 7500 mile change interval and he suggested that was more of safety margin for a new engine until it became a more proven engine.
I ran Blackstone on my 6.0L engines and they consistently ran 6,000 miles intervals. I changed every 5,000. With my 2011 truck, I sent in Oil samples at 5,000, then at 6,000 and at 7,000 and settled on changing my oil per the manual at 7500 miles and ran 150,000 on that truck. Repeated again with my 2015 truck, Oil change every 7500 and the oil samples were always good.
I've been following my Oil Life Change monitor on my 2017 truck and it pop's up usually just under 10,000 miles. My 2017 was one year old yesterday, I had 37,000 miles on it. So I did a lot of highway miles this past year. Daily commute to the school I was building was a little over 100 miles, Pretty much all freeway. So I'm not surprised to see 10,000 mile intervals
15 F350 CC Lariat SRW LWB Ruby Red, Ultra Predator Wheels with Toyo 295/65R20, BAKflip Fibermax tonneau, Diesel Products LED lights in the rear bumper and 20" light bar in the front bumper, Firestone Airbags and Airllift Wireless compressor.
11 F350 CC Lariat SRW LWB Tuxedo Black Sold at 145,000 milesl