Hi, I am a new owner of a 99 F250 supercrew 4x4 w/ manual transmission. It was well kept, but has nearly 300k miles. I was wondering what kinda of maintenance is required for this truck?
Also, what are the best fluids and additives used to keep this bad boy running great? Any other suggestion would be greatly appreciated.
Personally, I would change every fluid in the truck (oil, trans, x-case, gear oil, coolant, brake fluid, power steering etc). Maybe do a buzz test and compression test if you have access to the equipment just to see how she is doing.
As far as fluids and intervals, this is what I do:
Oil: Summer whatever brand name (delo, rotella, delvac) 15w40 is on sale at the time, winter Rotella T5 10w-30...change every 6-7.5k
Trans: Napa Dex/Merc w/ lubegard cooler line flush at 30k (about once a year for me) - not really helpful for you since you have a ZF6
Power steering: Return line flush once a year using Dex/Merc
Coolant: Zerex G-05 w/ SCA check every other oil change (most people run ELC (coolants meeting Cat EC-1, Cummins 14603 or Navistar B-1))
X-case: Dex/Merc once a year
Front Diff: Mobil 1 75w-90 50k
Rear Diff: Redline 75w140 50k
Oil: ELF7405 (FL1995 is a good option too)
Fuel: Donaldson P550437
Air: PA2818 w/ cover