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.