[djneils98]

Originally Posted by Georgeandkira

No expert here either but since 3309 is the spec, you'll be OK using either.
One overlooked source of transmission fluid is the Toyota T-IV.
The "T" stands for 'Type'. Toyota/Lexus used the same transmission so the fluid is "mother's milk".

If you raise the left side a bit higher than the right during your drain, you'll get closer to 4l.
One economical thing you can do is buy 4l at the Toyota dealership and do your drain. If by some miracle the drained fluid is clear, red and lovely, you can be done until next time (30,000 miles down the road).

However, if the drained fluid is black and foul, you can complete the one drain & fill with the 4l and buy a 10l or 20l keg or case of 12 for subsequent drain & fills.
Who knows, the parts man at the Toyota dealership might give you a discount on a case sale.

I've used a variety of substitute 3309 fluids with success. The names wouldn't help you as products are relabeled in different countries.

For example, Valvoline markets a 3309 fluid here called MaxLife Dex/Merc LV (a confusing additional name as Valvoline uses the term "MaxLife" for various products).
The LV means "low viscosity". The product is not to be confused with common Dex/Merc which is an older recipe said to damage our transmissions.
This is why it's good you're doing this yourself. Many bad shops will do a drain & fill with whatever is in their drum.

thanks - so just to clarify - as long as the spec says 3309 all should be good regardless of the brand?