or less do to more city than highway. 15 to 18k to keep it healthy
I'll be the first to admit, Im no fluid expert. I'm also probably more lax than most about trans fluid changes. But doesn't 15k seem way short for trams fluid on a stock car with a stock converter?
If I remember right, dex 6 was supposed to be 100k standard change interval, or 50k with severe use. To change it at only 1/3 of the severe use interval seems borderline wasteful to me.
I can certainly see shorter intervals if you're doing something that creates a lot of heat - towing, road racing, drag racing with a loose converter, etc but I can't see the point on a stockish daily driver.
Im much more strict on engine oil since blow by can dump all kinds of nasty stuff into the system that you don't really get with a sealed system like the transmission.
For the record, ive been doing 50k since we moved to AZ due to the high summer temps, although I'm at 48 and change on the vette and I'm REALLY dreading that fluid change with the transmission in the back!