My 2000 F250 7.3 PowerStroke is a great diesel with 148k miles on it.
In the 4R100 transmission I have run AMSOIL and do not have the stiff 2-3 transition problem. I have dual transmission coolers and the transmission fluid and filter has been changed at 50k intervals so I am coming up on one in 2k. I have had one mechanic tell me this was over kill but small cost and transmission still towing. Engine oil and filter at 6000 mile intervals and fuel filter every third oil change. Air filters as needed.
It has been chipped since 2004 (with what I was told was a Ford approved chip kit at the time) and has never had a problem. I do not think it is as hot of performance as some out there but it does have the power and torque to haul our 18000# setup. The Ford service department has never said a thing when I have had it in for recall work and service.
On the older 7.3s with the standard green radiator fluid you need to add the anti cavitation additive. The 99 thru 2001 with the "green" coolant need the VC8/FW 16/FW15/DCA4 SCA to prevent cavitation damage and I would verify that this has been done for the life of the vehicle.
Since the low sulfur mandate I also add a cetane booster and injector lubricant/cleaner.
Have the Ravelco chip in the truck to prevent the bandits we have around here from taking it for a ride south.
No plans on trading or upgrading any time soon.
