2017 GMC 2500 Duramax, 60k miles. Oil Suggestion please

[userfriendly]

Travis; You beat me to it. TES 668 is the new Allison ATF. I have a pail of the old 995 TES to use up. I like it for T-Cases and power steering too.
For diff's, I use 80W140. The factory fill is a little low in my opinion. Typically I try for 1/2" below the fill plug, but more often than not
it's running out onto the ground.
I just changed the rear diff and t-case on a 2014 Ford Escape (80W140). Obviously it had not been changed before. Instead of trying to fashion a 3/8" drive tool like the videos show, I drilled a 1/2" hole in the cross member.
The Escape transmission got the TES 995 drained from the Allison.

 

[Fahrvergnügen]

This is why I believe on vehicle fuel filter maintenance is important, you can control that. You can’t control what happens at a fuel station.

Just my $0.02

Yes 20,000 mile fuel filter intervals but unfortunately, water still makes it to the pump and injectors.

 

[BeerCan]

Yes 20,000 mile fuel filter intervals but unfortunately, water still makes it to the pump and injectors.

Ford at least recognized the problem and starting in 2017 put a much better filter system on the superdutys. It's bigger than the older one and holds more water in the drain area. It is also a much better type of filter. I drain mine monthly and I think I have gotten a few droplets of water 1 or 2 times. I think people fail to do the monthly drain and that's what gets them, 1 bad load of fuel and it could be disaster.

I go 30k miles on my filters because I do the monthly drain. My biggest issue at one time was dirt, I had a bunch of it in the filter. I think I narrowed it down to 1 station I was using and of course stopped going there. No more dirt after that.

 

[tnt_motorsports]

Yes 20,000 mile fuel filter intervals but unfortunately, water still makes it to the pump and injectors.

That’s why I added an additional fuel filter and fuel water separator under the cab of my 2012 Ram. I left the under hood filter and water separator in place as well. The kit is from Throttle Up Industries. It works awesome and I can use Fleetguard filters.

I generally shoot for 1 year or 15k miles on the 2 spin on filters. The under hood one is every other change.

Just my $0.02

 

[Fahrvergnügen]

FASS filter systems are great too!