2014 ford 6.7 Amsoil hd 5w40. 11k

[Gameboynws]

Amsoil HD 5w40
Amsoil full flow filter
Insane diesel bypass.

11k miles, truck mostly used as a tow vehicle.

Where should limits be set for extended oil changes?

Iron ppm
TBN
Other factors

 

[mattd]

Is the truck deleted? By the fuel dilution I would say yes...?

 

[CarbonSteel]

Blackstone's universal average for Fe is 32PPM @ 6,500 miles or about 4.92PPM per 1,000 miles. You are 2.24PPM per 1,000 miles or less than 1/2 the universal averages. I tracked about 2.98PPM per 1,000 miles on my 2015 without a bypass system and averaged a TBN of 6.45 on an average OCI of 5,030 miles.

You still have life left in the oil especially with such low fuel dilution. I see no reason wny you cannot extend to 15K and resample at that point. I am assuming your truck has to be deleted.

 

[Gameboynws]

Yes, truck is breathing freely