Borescope of cylinders with pix

Excellent post. How much oil are you burning (if any?)

 

Here is an older post that had some piston pics. Does not help much but gives some ideas.
interesting oil study by Infineum | PriusChat

 

very worn cylinder bores. Its a little oil eating monster.

 

Yeah, if you look our car up on Toyota site, it'll say it's never had an oil change. You have to take that info with a grain of salt. Too, a car that's got full service record at Toyota, might actually be neglected: owner's that are averse to DIY, have the dealership do everything, maybe never check the oil. And the dealerships likely just pull the drain bolt, but never check the level beforehand.

 

Glad you did the follow up post. Those cylinders looked just fine to me. I would be running high mileage blend in it and change the oil every 5000 miles and see you at 300k or when its time to work the battery pack.

 

Thanks for the update, Sorry to bump old thread. Prius 2nd gen battery last about 10-15 years depends on the temperature we live. newer generation especially 4th gen, last at least 15 years (15 years warranty in some countries). For the oil consumption issue, 2nd gen does not have problems. My 220k miles 2006 Prius only consume 1/4 quarts every 10k miles/year with full synthetic German Castrol 0w-30. My 3rd Gen 2015 Auris (using prius engine) does not consume oil in 10k miles/year period but it only has 60k miles. I used Total or Shell gasoline and 0w-20 Castrol Edge or Mobil1/OEM. I have not checked the cylinder with boroscope since it is pain in the nuts to access the sparkplugs without removing cawl.

Do you plan to try Fuel Additive with high PEA contents like in Gumout All in one, Redline, BASF Keropur G, Techron, etc? I believe that helps for such deposit although takes few thousands miles to get reasonable cleaner.

 

My G2 has run Redline 5-30 engine oil for years and you can eat off the valve train area its so clean. Really good oil I use it in all my cars.

I bore scoped my G2 around 125,000 miles and I see bare metal on the top of the pistons no soot at all. I take that back they all have a thin circle of soot on the piston tops. Thats good oil.

Here's one:

 

Thats a good sign of good engine oil that keep piston rings lubricated and clean. However, my questions was about redline fuel system cleaner not oil. I am wondering if any of you experience light detonation/pinging at light load. Not at full throttle or low load.

 

Your pictures of cylinder wall is a sign that your cylinder is almost like new. You still see crosshatch pattern from the honing in the factory. Worn engine usually has no more sign of cross scratch patter anymore. After all, Only Toyota and Honda makes really strong aluminum alloy and steel for engines. They are hardly any wear even after 300k miles.

 

Would too weak piston rings be a factor too?