Originally Posted By: pacc
Originally Posted By: dnewton3
The OPs question is "
So is it all equal"? (referring to the two brands he mentioned, but fairly expanded to the overall market of DEX VI).
That's a bit hard to tell; no one has ever run a large trial to determine that, AFAIK. But, I have the next best thing; I do have about 200 UOAs on the Alli 1000 transmission. I can tell you with total certainty that all the DEX VI fluids do extremely well in wear-protection in this tranny. I have seen no evidence whatsoever to show that a brand-name DEX VI is superior in any manner to a house brand DEX VI. In fact, the real data shows that the Alli 1000 transmission is very low-wearing overall, and really does well with about any decent ATF (DEX III, TES-295, Clones, DEX VI ... it just does not matter). Just like the Dmax engine is fantastically low-wearing, and has no penchant for any brand/grade of lube, so also goes the Allison 1000 series.
Why not walk into Walmart and get their ST branded DEX VI? By far the cheapest and easiest to get; hard to beat that price and availability. And before you bash it as a cheap lube, just realize that it
IS licensed to the same standard as all the other GM-approved products, including the two the OP mentioned.
But hey, why let facts and data based on real-world wear analysis get in the way of good ol' fashioned brand bigotry and internet mythology?
So, I should be ok with a store brand? Cheapest thing on the shelf?
Your question is a bit vague, so I'll elaborate based on two choices
DEX VI: yes - any store brand or name brand that carries the official GM license will assure it's a good fluid. I suppose that there would be some possibility that a higher grade base stock may be available in one brand or another, but frankly you'll never know the difference in terms of wear control. And I truly mean never, ever know the difference. So might as well choose a DEX VI based on cost. Here I suspect that the ST from W/M will be about as low cost as you'll find a licensed product, unless you have a coupon or some other BOGO option.
Not DEX VI: You'll still be OK with a decent recognizable store brand ATF like some of the Dex/Merc options out there. Now, if your vehicle calls for DEX VI and you're still under warranty, then you may not want to venture off the reservation to a non-DEX-VI option. Here, maybe only stick with the VI if warranty is of concern. But in terms of wear rates, the Alli 1000 really shows no preference whatsoever in terms of wear for any brand or base stock. It just wears well. You will, however, get longer OCIs out of using a syn base stock. But you'd be surprised how long even a dino ATF can last.
I would caution about the "
cheapest thing on the shelf" mentality. I am a BIG fan of getting a good ROI, and there are many inexpensive fluids out there that do an excellent job. But don't misunderstand my point about savings. "Cheap" can imply a use of sub-standard fluids. For example, there are many lubes on the PQIA that don't meet API specs; those are not "cheap", but they are "costly" in that they will ruin your equipment in short order. The PQIA issues "alerts" for those substandard fluids. But I don't recall ever seeing a recognizable house brand ever in alert status. Places like WalMart, AAP, AZ, Napa, etc still source decent lubes from independent refiners/blenders for the savings, but they still generally hit the mark in terms of product segment they target.