Originally Posted By: G-MAN
Originally Posted By: dnewton3
Originally Posted By: G-MAN
Originally Posted By: beadvised
Is Castrol or Valvoline any better than Supertech ATF+4?
Because of Chrysler's (superior) licensing requirements, all ATF+4 fluids, no matter who the manufacturer, are chemically identical. That can't be said for any other ATF. Buy the Supertech and save some money.
I believe that the license for the Dexron VI (GM's current fluid) is also a spec based upon a licensed chemistry package. So, techinically, you are incorrect in stating "
that can't be said for any other ATF." Walmart pays for the GM license rights for the DEX VI; it's probably every bit the fluid it is required to be.
The Dex VI license is still performance based, not formula based. GM leaves it up to the additive makers to develop a formula that meets the performance spec, then the formula is licensed. The additive makers then sell the formula to blenders and a sub-license is issued for the finished ATF product. Nowhere in this licensing scheme does GM specify the formula, which Chrysler does for license ATF+4. Right now there are ten different licensed Dex VI formulas used by the various blenders to make finished Dex VI ATF. Thus, unlike with ATF+4, only the brands of Dex VI that use the same licensed formula are chemically identical. With ATF+4 there is only one formula (based on a Lubrizol additive package), thus no matter what the brand, all ATF+4 is chemically identical.
I disagree, at least in part ....
Here are a few links and quotes:
http://www.imakenews.com/lng/e_article000384801.cfm
...
GM will license chemistries that meet the specification's requirements, leaving it to additive companies to issue sub-licenses for approved finished fluids.
Here is a list (from 2009) showing all the official licensed products. I'm sure it's probably larger now:
http://www.imakenews.com/lubritec/e_article001628035.cfm?x=b11,0,w
DEX VI is chemistry based. For a short time after introduction, as I recall, only Afton had the license. Many have jumped on the bandwagon as you can see. GM licenses the chem packages, then the sub-makers license out the fluid.
No GM chem license = no sub-market products.
Walmart is just as valid in DEX VI as is AAP, AZ, Napa, Mobil, Pennzoil, Castrol, etc. They all carry a unique license. That license is based upon the sub-market final product, but the chem packages are essentially the same. It is the lube maker that can choose the base stocks, but they are under contract (as I understand it) to use one of the chem packages as licensed.
If you see it differently, I'd like to know how ...