So just to clarify, if it's Dexron XI will it be a, for lack of a better term, "full synthetic"? I've seen some ACDelco brand Dexron XI with "full synthetic" in the description and some ACDelco Dexron XI w/o full synthetic in the description?
I use MaxLife synthetic with great results in my Tahoe. Make sure you do complete fluid transfusion through the ATF cooler line at the radiator. That's easy and correct way to get fresh fluid throughout the system.
I believe ALL Dexron VI are synthetic by nature of the VI spec ...
Originally Posted By: Ethan1
Anything that says Dexron VI on the bottle. Synthetic if you prefer.
Not all Dex6 is full synthetic...or created equal..found that out the hard way. I switched my trucks from the AC Delco branded stuff after samples continued to show it breaking down and losing viscosity. Switched to Chevron/Halvoline full synthetic Dex6/Multi and now have no problems..good samples at 40,000 mile drains in commercial service.
Originally Posted By: PiperOne
Not all Dex6 is full synthetic...or created equal..found that out the hard way. I switched my trucks from the AC Delco branded stuff after samples continued to show it breaking down and losing viscosity. Switched to Chevron/Halvoline full synthetic Dex6/Multi and now have no problems..good samples at 40,000 mile drains in commercial service.
Can you post the analysis that shows the fluid breaking down?
Havoline/Chevron are by far the least marketed and known fluids ever. They are good fluids and hold well.
Dex6 is such a great fluid picking any of the good brands will serve you well. Valvoline, Castrol are readily available and great fluids.
Originally Posted By: kschachn
Originally Posted By: PiperOne
Not all Dex6 is full synthetic...or created equal..found that out the hard way. I switched my trucks from the AC Delco branded stuff after samples continued to show it breaking down and losing viscosity. Switched to Chevron/Halvoline full synthetic Dex6/Multi and now have no problems..good samples at 40,000 mile drains in commercial service.
Can you post the analysis that shows the fluid breaking down?
I'll have to look...I think it was before we started using Polaris and having electronic sample records. Basically the fluid was coming back with low viscosity and oxidation. Not terribly bad..but enough it got flagged. Anecdotally, it did seem to improve shift quality and the oil comes out without showing signs of color change....not scientific obviously lol!