2ZR Turbo Yaris

[tmontague]

Originally Posted by 06YarisRS

That's the attitude. Lol. And, you're bang on about the trannies being cheap. I found one a while back on ebay that was from a wreck, something like 18000 miles on it for around $300.00 usd plus shipping.

I've always been an OEM trans fluid guy, especially after owning a Grand Caravan. It was ATF+4 or nothing. So, it's established that a good performance fluid would be perfectly compatible with the auto? Because, I would hands-down swap out the fluid for its superior properties if it was truly compatible in both the short and long term.

nothing wrong with OE fluids but your car is far from OE spec, not only with the bigger engine but the turbo as well. You likely will be fine with regular fluid changes as you have a cooler but I'm thinking more in the area of shear resistance from a better fluid.

OE spec fluid would meet sheer requirements the trans would face with the stock engine, in your case the clutches are working over time and I think a more sheer stable fluid would be some extra insurance. I have never heard of an issue with Toyota trans running Amsoil or even other fluid like Maxlife - they don't seem to be very sensitive to fluids as long as the fluid states it is compatible.

I personally always flush my used Toyota's with Maxlife simply because it is well priced and available locally to me. According to BITOG it is a pretty robust ATF and has always run well in my Toyota's (and Subaru's) that I have put a lot of mileage on. If I was in your situation I would likely go with an Amsoil product but it may be overkill. Just something to think about. If you are good with your fluid changes then you likely will never have to worry