750k mile preventative service recommendations?

Save your money for new dpf unless you’ve done it already. Many dpfs are replaced around that mileage but yours isn’t acting up yet but could in the next year or two .. watch oil pressure if it drops do pick up seal otherwise just drive it .. “if it ain’t broke don’t fix it “

 

Last time you changed transmission and rear end oil?
It’s high because its synthetic but it could save you from either going out, that oil breaks down too, but gets overlooked.

I’d keep up with maintence and run it for now.

 

i change mine out every year in September/October may not need to be but it’s cheaper to stay top and not have to replace

 

Yup im always 80k+ so i do mine every 6 months and it comes out dirty.

As for 750k it depends on what you want to spend. If you keep up on general maintaince then id say your likely good until something breaks. Otherwise you COULD have your pumps, injectors, plugs and such tested. Run a blowby oil test if you aint already and dyno to ensure nothing is out of whack. Replace all belts and hoses if you havent done it recently.

New hub seals all the way around if they havent been changed. Have the 5th wheel inspected for excessive wear or cracks. Sand and repaint any exposed rust and metal on the frame. Id replace the cab airbags as they tend to be pretty worn. Check your shocks, leafs and springs. Have bushings inspected, id replace all the fuses with new just to avoid corrosion problems. Have the compressor health tested change all filters across the truck. Check the condition of your lights and plugs. New headlights/wiper motor/blower motor for the AC/defroster.

And the list goes on and on. Honestly, like i said it just depends on your budget.

 

It is only 6 years old, what prevention? Even getting new truck will not prevent from anything can happen. As it was mentioned above, I'd keep few crucial parts in the truck, otherwise keep on trucking, there would be same amount for replacing something broken as it were replacing it now, to prevent it from being broken.. well, maybe extra for towing, if any.

 

If you changed the rear end gear oil at 500,000 it's tine to change them again.

 

Last truck I had had original oil in trany and diffs I've put myself for over a million miles with no damage to anything. Not a biggy thing to worry about. Gas pedal is concern, not oil itself.