Be careful with some of those dexrons as you won't have a working transmission anymore. I know i know the whole "i've used it for years with no problems" and "this friction modifier makes it SP equivalent".

Just remember that these are Japanese trucks with Japanese parts and Japanese manuals translated into English. I've found more than one serious mistake in the manuals, My favorite is the 90ftlb of torque on injector assembly I tried it and it didn't work and i have the broken injector as a reminder.

I think there are a few other threads on this subject, even a mobile 1 vs Diamond SP thread. Ray i heard a rumor that you can get Diamond SP at a discounted price at the Hyundai dealer stickered as Hyundai SP or something. I personally just have the dealer do my trans flush as it is cheaper than DIYing it because they have the machine to do it.