Hey I just saw your reply that your Tacoma takes Dex III. Just wanted to clear up the whole situation back in September. This new Tacoma DC I bought is the 3rd one I've had. That's how I accidentally put Dex III in it, as my last 2 took Dex III. I was told by Southeast Toyota Corp that the T-IV was just starting to be used midway through 03' on the Tacomas. Even the Advisors and Mechanics at 4 dealers within 50 miles of me didn't know Toyota started using T-IV in thes Tacomas in 03'. That's how I ended up talking with everyone from Toyota Corporate to Mobil Engineers trying to figure the compatibility issue out.
Mastiff