I’m new to the world of servicing automatic transmissions. I just bought a 2009 Scion with the U241E four-speed auto. It has 120k miles and I think it’s time for new fluid. The manual specs Toyota WS fluid, which is $$$. For the final fill I will likely use Valvoline Maxlife but I want to do several short interval drains before the final fill. Rural King sells a Dexron 3 equivalent fluid at $27 for a two gallon jug so I could potentially circle a whole bunch of fluid through cheaply. Walmart sells their Supertech Dexron 6 for $20 a gallon. Is either any better or worse for a short interval fill?
Or should I just spend the extra bucks and use Maxlife for the whole thing? Does it matter? Am I overthinking this?
Or should I just spend the extra bucks and use Maxlife for the whole thing? Does it matter? Am I overthinking this?