Good afternoon, HD2424,
I always go by what the manufacturer wants you to use. For your vehicle GM recommends DEXRON VI. Original you probably had DEXRON-III. My information says you will need 5-6 quarts for a drain and refill, but I would get 7 or 8 and just return what you don't use. Just to be safe.
There was a Technical Service Bulletin (TSB) released April of 2007 TSB-04-07-30-037C, then updated in 2011 04-07-30-037E. This TSB basically states 2008 and prior GM Passenger Cars and Light Duty Trucks, among others, should be changed from DEXRON-III to DEXRON-VI. (I will attach screenshots of the TSB for you.)
Normally the rule of thumb is to go by what is stamped on the dipstick, but I would follow the TSB in this instance and use the DEXRON-VI that GM recommends.
I have a 2001 Chevrolet Suburban with a 4L60E, and I use DEXRON VI.
According to the TSB, DEXRON-VI is compatible with prior fluids including DEXRON-III meaning you do not need to flush out the DEXRON-III first unless it's a warranty repair.
There are many fluids out there, most are universal such as Amalie. I would stay away from them all and use the manufacturer's fluid.
This fluid is a full-synthetic. In my opinion synthetic is better. It is chemically modified to provide many benefits including working better at higher temperatures or extreme cold as well as better viscosity which helps with horsepower-loss and fuel efficiency, as well as many others.
Thank you,
Brendon
Images (Click to make bigger)
Monday, February 27th, 2023 AT 2:00 PM
