Toyota Repair: transmission fluid, dextron iii, inexpensive scanners

Question
Tim--

I just had the 60k maintanance done on my 2005 Sienna, and asked that the
trans. fluid and filter be changed. I gave written instructions to use Toyota
ATF Type T-IV fluid, as specified in my owner's manual, but they used "ATF
Dexrtron III Mercon Pro," plus "Lube Guard Friction Mod" as an additive, which
my mechanic said makes it the same as the Type T-IV. He's a good mechanic,
but I'm a little uneasy with the switch. What's your opinion?

One more quick tranny-related question. Upon first start-up in the morning,
the engine revs to 1500 RPM for awhile. This seems too fast, and I worry that
shifting into reverse at that idle speed stresses the transmission. Your
opinion?

Thanks!  --Jeff

Answer
Jeff,
Dextron III is fine, I recommend any name brand cleaning additive
added to a transmission when the fluid and filter is changed.

That is a little high on the fast idle. That could be several different things; vaccum leak, sensor dirty, etc. Take it to a Toyota repair shop that has a very expensive scanner, this should pinpoint the the problem. Inexpensive scanners like the ones at auto parts stores don't provide enough detail.

Tim