So does SP-III replace SP-II fluid?

And is this useable? http://www.amazon.com/ENEOS-Automatic-Transmission-Fluid-SP3/dp/B0034GY8J6

I too am a believer in using OEM AFT...
Here is a link to a rep. that has worked well for me.
They deliver right to your doorstep...

http://www.streettunedmotorsports.com/diy/diy_fluids.htm

I just wanted to post an update to this old post in case anyone was interested. I now have 237,000 miles on the truck and drive it regularly. My wife used the truck as her commuter vehicle for two years, and I have taken it on several trips with my two buds and our riding gear down to socal pulling a trailer with three motorcycles doing 65mph most of the way and no troubles. Just did our 3rd trip this summer in the truck since the ATF swap and no issues. I'd say the Mobil 1 ATF is a good choice for the Monty SR transmissions.

Will keep posting updates as the miles rack up. <img src="/forums/images/graemlins/smile.gif" alt="" />

Best regards everyone!

Good update Scottie. Glad you were willing to take the risk and see if Mobil 1 would work especially since it didn't exactly have a stellar reputation after it was tried on a gen I transmission. <img src="/forums/images/graemlins/kewl.gif" alt="" />

Out of curiousity how many of those miles have been with the Mobil 1? Have you changed the AT fluid again since you went to Mobil 1? Any chance you had an oil analysis done after you first went with Mobil 1 in your AT?

Out of curiousity how many of those miles have been with the Mobil 1? I bought the truck at 205k so I don't have a good history of the brand used. However I know it was at least serviced regularly because I have the receipts since 70k miles when the PO started ownership. She mostly had it serviced at Jiffy Lube type places, so I imagine the fluid was nothing special, probably just house brand Dextron III.

Have you changed the AT fluid again since you went to Mobil 1? Nope.

Any chance you had an oil analysis done after you first went with Mobil 1 in your AT? Nope.

I'm sorry for not backing this statement with data, but...sometimes those fluid recommendations are bullsh*t.

It seems there are, quite often, other fluids that will work quite well, but the factories want you to buy the one they have in their back pocket.

I've used Royal Purple with *amazing* success - the kind that makes me wonder if I just got *really* lucky with these transmissions, or if the fluid really did make a difference. One of my DD/weekend track cars with an Aisin-Warner trans got Royal Purple the week after I bought it. It went from 222hp to 402, from 223tq to 412. It's still on the same stock auto trans, 3+ years later, running 12-second passes. The first engine went out, and I replaced it - but kept this trans on it. It's still going, and it's about to be attached to the THIRD engine. Yep...3 long blocks, 1 transmission. I don't get it either. <img src="/forums/images/graemlins/zombie.gif" alt="" />

Anyway...here's what I mean about the bullsh*t...take a look at this application list:

http://paceperformance.com/i-5154628-rpm...-container.html

...if that fluid works in place of ALLLLLL of those other fluids, then doesn't that mean there's a good possibility there are other things that might work??

That said...I haven't replaced the fluid in the SR yet as I only recently bought it and I'm not driving it yet. When I *DO* flush the trans before my first trip, it will get the Royal Purple treatment. In the mean time, I topped it off with Castrol Multi Import.