I’ve a 2005 Chevy Astro AWD, 78,000 miles with a transmission cooler that I use for camping, towing, hunting, retriever training. While I change the transmission fluid at an increased frequency but I’m inclined to change it more often.
I don’t change the oil myself, but use a mechanic to drop the pan, change the oil, and change the filter. I found out about a device called liquivac that can be inserted into the pan and aspirate out the fluid in the pan. Since that won’t completely change the oil, I could aspirate out 4 quarts, replace with new oild, drive the care, and repeat the cycle for 3 total times to dilute the oil to the extend that only a little of the old oil remains.
How effective do you think this would be to do this between the 15,000 mile transmission fluid changes I already have performed?