Originally Posted by BadgerRoo
I may get blasted here.. but.. I'm getting the aftermarket cooler installed next week by my GM service center and do not think I'll be getting a full trans fluid exchange at that time. I only towed my new camper once a few weeks ago (home from the dealer) and my transmission temp never got above 170 degrees F and was usually in the 150's; not to mention I never get above 120 degrees F without towing. My vehicle barely has 40,000 miles on it and has runs on synthetic trans oil already.
I think I'll be fine if I get it fully changed out at the end of next winter in approx. a year. Wouldn't you think so?
And thanks for the blackstone lab idea, appreciate it!
Odds are your fluid is fine right now, and you're coming up on a regular change interval since I think you're on a 50,000 mile schedule with the syn. I'd get it changed at the normal mileage when you reach it.
The yearly thing is mainly to get people to think about it. Is it best? Yes, truly necessary? Not at all. The big concern is if it sits a lot and isn't run regularly. That allows the oil and detergents/additives to separate, moisture to condense and never get burned off, etc. That's where the yearly comes to play.
As for the future, once you get your change done at a regular interval if you tow a lot I'd keep an eye on it and change a little early, I'd subtract your towing mileage from the interval. For example, if the interval is 50,000 miles as I suspect and you tow it 10,000 miles over that interval then I'd get it changed at 40,000 miles, up to half the interval or 25,000 miles. Even at 40,000 miles that's still two or three years if you're an average mileage driver.
And I'd still look into the oil cooler, engine oil is very neglected and the lines and all won't cost that much.