New plugs, ATF, & throttle body cleaning

I'm a new owner to a 2007 Prius Touring (Driftwood Pearl) with 195K miles on the odometer. It has full leather interior, GPS, smart key, 6 disc in dash CD changer, foglights, 16" alloys. I believe it was the top Touring package #6. I was able to retrieve some original dealer maintenance history for its first 7 years through 72K miles. From 2014 through 2024, its maintenance history is undocumented. In that span of 10 years, it appeared to have gained roughly 123K miles. 12K miles a year is not terrible, but also not a pampered life. I'm likely the 4th owner.

At some point in its life, someone swapped out the original HID with a set of Eagle Eyes standard headlamps. The lens are clean and clear.

Today I tackled the transaxle fluid change. I drained out a dark murky thick concoction. I chose to go with Valvoline Hybrid Vehicle ATF in lieu of Genuine Toyota ATF WS. My local Toyota stealer price was $16/qt. The Valvoline HV ATF cost me under $7.50/qt. Perhaps I overpaid for the same Valvoline MaxLife ATF just rebadged for "hybrid vehicle", who knows. When I compared the specs between WS and Valvoline ATFs, they numbers were pretty close, more so than the Aisin WS equivalent fluid. The measured drain out was 3.75QT and I poured in 3.75QT. The drain plug takes a 10mm hex and the fill plug was a 24mm socket. 29ft-lb torque for both with two new crush washers.

I also removed the air filter box and decided to clean the throttle body. I should have captured before photos of the TB. It was brown, dirty, and mucky. Deep in the intake was more greasy brown drippings. I stuffed a rag down the throttle body and went to work with a brush and some carb cleaner spray. I let the cleaner sit in the intake runners and took a lunch break. Afterwards, I stuffed a rag down and sopped it all up, got it as clean as I could without removing the entire TB.

The last thing I did was to swap out the spark plugs. Out came these Denso Iridium SK16R11s. Not sure how long they've been in this car. But I figure being close to 200K, it deserves a new set of spark plugs. I run NGKs in all of the Hondas I've ever owned so I went with a set of NGK Laser Iridium. The service manual called for NGK IFR5A11 but RockAuto listed NGK 4996 IFR5T11 and came pre-gapped to 0.044". Torqued the new plugs to 13ft-lbs no anti-seize.

The Prius to-do list to be continued:
- Rear drum shoes
- Brake fluid bleed
- Engine coolant replacement
- Hatch lift struts
- Add a second smart key fob

 

Unsure of the prior oil change. The oil level is at the top mark and still translucent and not black. I've driven around 200 miles since purchase and the oil level has stayed put. I ran half a bottle of Berryman B-12 cleaner through a full tank already. There was a date sharpied onto the cheap FVP jobber filter with a windshield service sticker. The filler hole appeared dark and similar to high mileage old Corolla that I have.

I have a replacement PCV valve in hand and will likely do an oil change next time and swap out the PCV valve.

Here's a pic of the engine bay. It's a west coast car so probably hasn't ever seen any road salt.