[alexusw]

After looking through the service records, my 07 Tundra has the wrong transmission fluid. I bought the truck used and saw that the T4 automatic transmission fluid exchange was last performed about 38k miles ago. I find it concerning because it should have the WS fluid instead of Type 4. Will type 4 fluid affect my transmission? Should I flush it with WS fluid or is a drain and fill safer?

 

[alexusw]

Also, the first 2 fluid exchange was with WS so I don’t understand why the 3rd fluid exchange was performed with Toyota Type 4 fluid. Truck has 216k miles