I can not see any automatic transmission going 150,000 miles with out a fluid change. Change your fluid every year or every 30,000 miles, which ever comes first if you want long transmission life. JJ wrote:FORD is full of it! This one of FORD's better ideas. I don't buy your BULL fudge or anyone else's! And I never will! The auto technicians have a saying. I can't stand people that have to lie about it. It's a matter of chemistry, and not as black-and-white as you've been making it out to be.I keep posting it and will continue to post it because of personal professional experience. Spec the oil properly, and drain intervals can be extended. The Europeans have been using semi-synthetic and full synthetic oils, motor oil and transmission fluids, for years, and mandated longer drain intervals by law (used oil is hazardous waste), and no one is reporting any problems. JJ, you keep posting these responses every time someone posts anything about longer drain intervals. It's a matter of chemistry, and not as black-and-white as you've been making it out to be.

The 75,000 it went was on a synthetic made at 1998 specifications. The fluid will turn to varnish and harden the seal long before 150,000 miles.Aren't most of the new transmission fluids using a semi-synthetic oil as their base oil? My 1996 Taurus transmission has exactly two fluid changes, at 30,000 to a full synthetic, and at 105,000 to a full synthetic. Thanks.FORD is full of it! This one of FORD's better ideas. Has anyone had issues going the 150K w/o changing fluid? Any input here? I'd appreciate sound basis for recommendations rather than old wives tales. I'm a bit reluctant to go 150K w/o changing. I live in South Florida and I have historically swapped out my fluid to synthetic by 50K or 60K - sooner if it is a vehicle I tow with (I won't tow with this). The book recommends you check fluid every 15K miles, but not to replace until 150K miles.

InmanLanier wrote:OK, gents - after two emails to Ford, I finally did confirm I have the Aisin 6 speed tranny (I think Aisin is a division of Toyota - there's also Aisin-Warner).

Aisin f21 transmission fluid