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https://jalopnik.com/check-out-what-a-toyota-prius-engine-looks-like-after-3-1848018980 <Check Out What A Toyota Prius Engine Looks Like After 303,000 Miles This Prius engine was neglected, but it was still alive and kicking. Screenshot: Speedkar99 / YouTube (Other) A Toyota Prius has joined my shared fleet in what so far is a positive Carvana experience. Since I love knowing all I can about every vehicle in the fleet I’ve been binging all sorts of Prius videos. One of the ones that I’ve come across is a detailed teardown of a high-mileage 2004 Prius engine that looks good, even after some neglect. A few readers have expressed concerns about picking up a Prius with 90,000 miles and expecting to run it 30,000 miles a year. That kind of driving can be hard on a car. Yet, I’ve seen plenty of second and third-generation Prii driving around in taxi service with more than 300,000 miles and still kicking. If, like me, you wonder what the engine of a high-mileage Prius looks like, YouTuber Speedkar99 tore one down and examined its wear. The engine here is a 1.5-liter 1NZ-FXE inline-four from a second-generation Prius with 303,561 miles. This engine uses a low compression ratio and a high expansion ratio. This works by holding the intake valve open longer for a reverse flow of intake air into the intake manifold, simulating an Atkinson-cycle engine. The result is less power but more efficiency, perfect for a hybrid. The 2ZR-FXE uses a similar system. Screenshot: Speedkar99 / YouTube (Other) The YouTuber informs us at the beginning of the video that the engine was running fine without issues before the teardown. The Prius the engine was taken out of was a parts vehicle. Our host tears through the engine, giving us a thorough explanation of how everything works. But we’re here to see how this engine has fared over 17 years, and the video certainly delivers. First up is a tour through the positive crankcase ventilation system and even the throttle body, which presents some dirty build-up and could use some good cleaning. Screenshot: Speedkar99 / YouTube (Other) But the valves appear to be clean thanks to the injectors. Next, we take a peek under the timing chain cover, where things look a little discolored. The YouTuber says that this is likely because the car may have not gotten timely oil changes but even then, there isn’t a lot of wear. Screenshot: Speedkar99 / YouTube (Other) The camshafts and the head also look clean for the mileage they’ve gone through. Screenshot: Speedkar99 / YouTube (Other) Further in the teardown, the YouTuber cracked open the oil pan to reveal a sad sight. Screenshot: Speedkar99 / YouTube (Other) Yep, that’s sludge. They blame the sludge on cheap oil, the cheap oil filter and deferred oil changes. The filter in the oil pump pickup tube appeared to be pretty gunked up and the pistons have some carbon buildup on them. The bigger point of concern for the YouTuber was clogged-up oil control rings on the pistons. Screenshot: Speedkar99 / YouTube (Other) The host explains that this could mean that the engine might not have been getting proper lubrication there. Overall, the engine looks pretty good despite some neglect. It’s no wonder why Prii are able to rack up so many miles on their odometers when they appear to be so durable. Still, the sludge build-up is a perfect example of why you should always keep up on your maintenance.>

I noticed some greenish sludge from inside the brake reservoir. Did not noticed any difference in braking power, brake perform very good. What is this green sludge inside the reservoir, never seen it before.

http://www.carbibles.com/engineoil_bible.html#blackdeath Summary - 2005 Consumer Reports article discovered that some engines from Audi, Chrysler, Saab, Toyota, and Volkswagen appear prone to sludge almost no matter how often the oil is changed. =Extract= I'm interested to hear your views on this...

http://www.carbibles.com/engineoil_bible.html

I've been talking with this mechanic in USA. He does engine core remanufactures and stuff. He says there are 2 ways you can clean a sludged engine. 1. Use AutoRx. 2. Buy loads of cheap engine oil and change it it every 500miles (800km)! He uses the 2nd method because cheap engine oil is readily available in the USA. The filter is even more expensive than the oil so he says maybe every 5000miles (8000km), he changes it. Wow! Like that it is around 10 bottles of 4L oil if your car takes 4L. He said he saw a lot of ruined engines with engine flushes on sludged engines.

Wow! Wikipedia has entry on oil sludge and even lists the car engines that have problem with sludging! http://en.wikipedia.org/wiki/Oil_sludge

This is what a really sludge up engine look like.

http://www.autosafety.org/getcat.php?cid=28

Wow, check this out. This is simply amazing.. http://theoildrop.server101.com/ubb/ultima...ic;f=1;t=012378