2004 Scion xB, Toyota T-IV ATF, 19K mi

[sithscripter]

Fluid is Toyota T-IV with 19K miles, 49K miles on vehicle, mostly freeway miles.

Iron: 49 ppm
Chromium: 0
Lead: 10
Copper: 12
Tin: 1
Aluminum: 23
Nickel: 0
Silver: 0
Silicon: 15
Boron: 40
Sodium: 0
Magnesium: 1
Calcium: 72
Barium: 0
Phosphorus: 223
Zinc: 14
Molybdenum: 0
Titanium: 0
Vanadium: 0
Potassium: 0

Viscosity: 5.48 cSt @ 100C
Water: 0%
Solids: Trace
TAN: 1.39

Viscosity is down to 5.48. I'd hate to see what it would be like if I stuck to the recommended 60K OCI ... I can't find any official numbers for Toyota T-IV ATF but Mobil 3309 is supposed to be 7.2 out of the bottle.

I'm sure it's fine for now but I'm sticking to a 30K service interval no matter what Toyota says.

 

[unDummy]

Yep, stick with more frequent intervals. I wouldn't even push it to 30k.

I'd also install an ATF filter and aftermarket cooling. The transmission isn't showing too much wear but the fluid is taking abuse.

 

[Cutehumor]

My 06 Vibe has a drain plug, so I'm just going to drain and replace every 15k miles. where are you guys buying a subsitute for Toyota T-IV? I don't want to pay dealer prices.

 

[flathead6]

Cutehumor: The ONLY 'substitute' for Toyota T-IV that I'd consider right now is Mobil's 3309, which only meets the specs. for the various vehicles using A/Warner A/T's specifying what Toyota refers to as T-IV. It is NOT a universal ATF...see the Mobil data sheet for 3309 on their website.
Having said that, may I offer a suggestion...this is what I did: Find a Toyota dealer on the web or get a price from your Mobil distributor for 3309 (case). Then go to a Totota dealer with your price and see if they'll match or beat it. Mine did, and I remember it was <$4.00 qt., which I thought was reasonable enough...got 'em down even more for a 2 case purchase. They're not likely to reduce their price for less than a case, however.