I have a 2002 Toyota sienna with 115,000 miles on it, this van was well maintained it has every maintenance record from the previous owner.
Toyota dealership did a transmission service in it multiple years ago and they put Toyota T-IV in it according to the maintenance record. Anyways I just noticed this situation now. The transmission however shifts perfectly fine no issues.
The owners manual and the dipstick both say Dexron III.
The transmission fluid in it is getting dark and I am wanting to service it myself so I purchased Valvoline Dex/Merc which says “Recommended for vehicles requiring Dexron III, Mercon and many other applications”
I was going to pull the transmission cooler return line and start up the van and continue adding new fluid until the fluid comes out clean from the cooler line.
However I was also thinking on just pulling the drain plug filling it up, drive it, repeat a few times to get the majority of the fluid replenished.
My issue though is because Toyota put Toyota T-IV there, is it safe to do drain/fill method with Valvoline Dex/Merc, can these 2 fluids be mixed because obviously the drain/fill method is not going to get all of the T-IV out but a majority of it will be diluted with fresh Dex/Merc I just don’t want some bad reaction between the 2 fluids to happen.
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