The OEM manual says the Transmission...

[civdiv99]

Or you could interpret page 3 of the attached ZF document to indicate any severe use could put you in the +/- 50K mile trans fluid changes category.

Be kinda cool if they defined "offensive" driving style; guess that definition depends on how cutthroat it is in a particular area.

[Ghost-Flame]

Originally Posted by civdiv99

Or you could interpret page 3 of the attached ZF document to indicate any severe use could put you in the +/- 50K mile trans fluid changes category.

Be kinda cool if they defined "offensive" driving style; guess that definition depends on how cutthroat it is in a particular area.

Offensive may mean Racing use, off road, pulling tree trunks out of the ground or or cursing while in traffic

I change mine every 50K just for the heck of it. Cheap insurance. And I have been scolded many times here for that. The manual says it must be changed.

My girlfriends grandfather had lifetime engine oil in his GMC pick up. He knew when to get a new one when the old one quit every 5 yrs or so (in case you are wondering 1970ish factory fill lasted about 70,000 miles before it siezed up), True story. Kinda the same logic with lifetime ATF that some of these guys use. better to wait til it fails than change it as regular maintenance(as per the manual)