Transmission Front differential oil spark plugs

I change the ATF WS, in the transaxle (it is both transmission and differential) at 30, 000 miles, 90,000 miles and then every 90,000 miles myself. Always open the fill hole before the drain hole and change the washers. It should take about 3.5 quarts, buy 4 quarts of ATF WS and two washers.

I follow the Toyota service manual on spark plugs, 120.000 miles and spark plug make DENSO SC20HR11, Gap 0.043 in.
http://www.toyota.com/t3Portal/document/omms-s/T-MMS-10Prius/pdf/2010_Prius_WMG_0W20_lr.pdf

 

tranny oil changes are all over the place here, because toyota gives no recommendation. you'll have to decide for yourself after reading others ideas and experiences.
spark plugs at 120k seems to be right. most find the old ones still in good shape. some have said they are difficult to remove if you wait that long, so it might be a good idea to remove them at 60k and use some anti seize.

 

Look at my trans oil at 46k miles.Now after the trans oil change my car is really smooth.

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Yeah, both "tranmission" and "front differential" equal: "transaxle", there's one thing. The fluid to use is Toyota ATF WS, you'll need to buy four quarts (or liters, up here), and they're a bit under $10 per. Both the fill and drain bolts are socket-head cap screws, with 10mm hex recess. Torque for both is 29 ft/lb, and replacement washer is good practice. Refill with the car level, and when it starts coming back out (somewhere around 3.5 quarts) you're done. A funnel with three foot hose extension is the simplest way to get the new fluid, working with an assistant.

A first change quite early will be most beneficial, say at the one year mark. Then you can extend the interval: maybe a second drain-and-fill after another 3 years?

 

Agreed. Just did mine over the wknd. Much smoother driving.