Hey all, Have a 2011 Prius model 3 at 155,000. Never had my transmission oil changed as I don’t recall the manual ever having a maintenance schedule for it. Not experiencing any issues right now but is this something I need changed? Like to hear recommendations and experiences from people who has had it changed man’s those that haven’t. Also, I’ve heard that servicing transmission oils can be risky as well as putting in new oil can cause leaks and issues due to having removed broken down matters that “plugged in” areas where necessary; also I heard it might apply up out transmission as it’s CVT? Thanks!
There is no harm in changing it at 155k miles. 4 quarts of Toyota WS fluid. Also these transmissions are plentiful due to their low failure rates, changing the fluid or not is up to you. But I personally don't believe in "lifetime" fluids
I’d do it. If you’re planning to DIY, it takes about an hour, and the Toyota ATF WS plus two washers should be around $40 USD, through dealership. More info in one of my signature links. (On a phone turn it landscape to see signatures)
Get yourself a big fluid syringe thing, it makes life really easy. I changed mine at 98k using an electric pump which worked, but was a bit clunky. Then I had to top it off after changing an axle and used one of these syringe things, and really this was so much simpler I think this might be my new favorite instead of the electric pump: Link to syringe on Amazon
