not available. Reading the specs it appears to be a lube that will fit the bill for the Z tranny. Plus the price per quart is less (in the link at least not sure of other pricing) than the Royal Purple at about $20 per quart at local auto stores. Last time I used the Purple about 3 years ago it was $12 per quart, price increase is crazy. I just might this Amsoil GL4 a try the next time I do a tranny service.
Let us know your results with the Amsoil. I still wouldn't make the brews of the different lubes.