72 Month Maintenance

I have a 2017 Prius Prime with 25,000 miles. After the first two years, I have done my own maintenance. This will be the 6th oil and filter change, never go past 5k, but changes are 12 months apart. I don't run the ICE often, but when I do, I make sure that the engine runs long enough to get fully warmed up. Wish it had a temp gauge, but...

I use Mobile One 0-20 and Toyota OEM oil filter.
I replaced the 12v battery at 22,480 miles
The gas in the tank is pretty fresh

For this service I'm planning to do:
Oil and filter
Air filter
Tire rotation
Clean battery vents
Engine and Inverter coolant change
Transmission fluid change (I know, but it has been six years and I want clean fluid around those two motors)

Thanks Mendel for posting all that good information for the above services.

Anything else that I should address at this time?

I still have the original maps in the GPS. I need to do some research on the best place to purchase and how to update. But I can always use my phone if needed.

 

Update after performing the above maintenance:

Transmission fluid change was straight forward with no real surprises other than how tight the fill plug was installed at the factory. The old fluid was clear and cherry red.

Following the factory procedure for the coolant change, I was only able to drain about half the coolant in the engine circuit. So I filled and ran the engine up to operating temperature and drained and filled again, not great, but acceptable I guess. The original coolant still looked like new.

One challenge for my old eyes is trying to see the new crankcase oil on the dipstick. At first glance it looks empty, but in the right light you can almost see the oil level. Must be very clean inside the engine or Mobile One 0-20 is invisible, or both.

I checked and filled the other levels and was surprised to see a dipstick in the washer reservoir, never seen that before.

The bottom engine cover was a little scuffed up, but came off easily and everything above it was very clean and looked like new.

I had picked up one spare push fastener at the dealership, and I broke one during removal, so...

The battery cooling vents on each side of the rear seat were perfectly clean, so I guess nothing to really worry about unless maybe you have pets.

The brake pads and rotors look absolutely new, so a nice benefit to having regenerative braking.

The meter shows 86% EV operation. The way we use this vehicle we have to actually plan trips just to try to use a tank of gas so that it doesn't get stale.

If Toyota ever puts this same PHEV drive train in a compact pickup like the Stout, I would bite.

 

"Since you don't have AWD, not rear diff to change fluid with. Was your old 12-volt battery having problems? We, still, have the original in the 2017 and I wanted to replace it but the battery tester still says it's at 100% so waiting for it to go lower."
"

I tested the battery and it was at about 80% if I remember correctly. I charged it up and tested again and the CCA was about 10% lower than the rating, so I decided to replace it. What started this was a low battery warning on the dash. Never caused any trouble and probably would have lasted for a while yet.

What I didn't know at the time is the design of the charging circuit is lower than normal, probably since it doesn't have any heavy loads like a starter motor. I believe Toyota may have designed this to increase the life of the battery, I don't know for sure.

If I had known that the charging system does not keep the battery at a full state of charge, I may not have changed it when I did.

 

Mendel and ColoradoBoo,
Thanks for the tips.
I didn't even consider brake maintenance.
I am lucky to live in the Southeast with very little corrosion underneath.
I think next year I will do the brake service and flush & bleed the brake fluid.
I'll probably be at 30k and 84 months.