Since Diamondmatic is part of Jatco...

[BearZDefect]

Old news, but if this wikipedia article is accurate:
http://en.wikipedia.org/wiki/Jatco

then it lends support to the idea that some ATF specs are different names for the same thing.

Ex, one of the Nissan ATF specs is equivalent to Diamond SP-III.

I know this statement stands of loose ground, but I don't see why Jatco would develop a special ATF spec for one customer vs another. Most of their evolving specs are just that - evolutions that improve upon the old products.


Does that mean that modern Hyundai ATs are Jatco ATs?

 

[bepperb]

The whole ATF thing, at this point, is a complete scam. By specing ATF fluids that last beyond the warranty period of vehicles, manufacturers don't need to worry about the MagMoss act, so they can specify you only buy ATF from them and don't need to give any information on the fluid.

So why wouldn't they? It's easy money for dealers, and probably for them. But from a consumer standpoint it sucks. There's no way of knowing what aftermarket fluid would work well since they have no interest in telling you.

But yeah, think of how many names there are for the same T-IV fluid.

Some Hyndai AT's may be Jatco. But they do make a 5 speed in house and are rolling out a homegrown 6speed in the near future if not already.

 

[mechtech2]

bepperb - ^^^ I smell this situation also, but can't get my self to fully believe that there are no important differences in ATFs.

 

[BearZDefect]

Originally Posted By: bepperb
...

But yeah, think of how many names there are for the same T-IV fluid.

Some Hyndai AT's may be Jatco. But they do make a 5 speed in house and are rolling out a homegrown 6speed in the near future if not already.

Thanks for the reply.

At least the T-IV names are well known here on BITOG - like the 3309 and Volvo equivalents.

Sounds like the 5sp ATs in the current Sonatas are home grown by Hyundai. No wonder they don't shift like a Jatco!