460,000 mile 7.3 powerstroke - M0S2 + Mobil 1 5w40

280,000 miles with lots of hard horse towing on a 2000 F350 dually 7.3. My oil is any old crap that the local shop puts in but I change every 3000 miles and I always check it's totally fresh oil/filter - cheaters are out there. Bullydog chipped and intakes changed and 4" Banks exhaust but the motor only comes alive once the intakes are enlarged, so chipping is not really necessary but they do haul a$$ if correctly modified. Bullybreaks are a great thing if correctly used. That engine has to breathe as International designed it and EPA noise limits killed it. Modern motor oils are all pretty good but diesels are dirty and super diligence is the name of the game. Why people buy the 6.0 or 6.4/6.7 is beyond me. The last decent truck made was the 7.3 generation. A transmission rebuild by a shop in Middleton NY is my secret - bulletproof. Perhaps I am just bitter as I can't afford a newer truck anyway.

Some of our larger equipment holds about 15 gallons of engine oil, so we usually pull a sample with a vacuum pump and base the drain interval on the results.

AHHA, caught you! That is some large (multiple) pieces of equipment with 15 gal sumps . So you DO own the North East part of the state, I suspected as much.

http://academytransmissions.com

Forget Jasper and other "heavy duty" stuff that 4R100 is the weak spot if you are serious. I don't care how far you have to drive go to this place but you need to book and don't ask for a quote.Ignore the 'owned by coalnewbie sign' in the waiting room

HAHAHAHAHAHA

Get it totally upped to a HD, as you all know, Ford made two versions of the 4R100 rebuilt automatic transmissions that are behind the 7.3L diesel engines in '99-'03 SuperDuty trucks. The OEM version, and a heavy duty version intended to compete with the BTS and John Wood rebuilt transmissions of the world. Both have the same 3-year warranty if properly installed.

If you plan to have the R&R done by Academy, you might want to pay particular attention to the Ford requirements for doing the R&R. If it's not done right, including replacing the oil-to-air tranny cooler, flushing the oil-to-water tranny cooler, and installing a Magnefine in-line tranny filter, their warranty will be void. Now when I see the Delaware Gap hill that is the killer of transmissions and with over 12,000# on my a$$ (way over) I like to see how hard I can accelerate. Coming down it's bully brake time and I still have some brakes left at the bottom instead of molten rotors. Of course, engine braking is not a new idea.

One final word, always carry a spare cam positioning sensor and a 10MM wrench and know how to change it.