505 CRO oil cleaner

Never heard of that type of "pour & pray"

But just googled it and it said it breaks up carbon and sludge, which clearly doesn't fix the idiot losers at Toyota who thought using the wrong piston rings in early Gen 3 Prius was an "advancement."

 

Until sometime in model year 2014. It’s interesting 2015 average on Fuelly has 0.2 mpg drop. Toyota’s need to make some mpg target left a legacy of oil burners.

 

None of the additives really work. "Maybe" if you start using them early on before there
is a problem it might slow the process.
But 200,000+ miles on any vehicle is a lot. And most people never used to keep their cars
that long. They would trade them in on a new car, or newer car with less miles.

It probably won't hurt to use it though. I tried some of the BG some or other stuff. No difference.
$15 wasted. But it was worth the try at the time.

 

At what rate? A cup or two between oil changes? A quart every thousand miles?

 

A compression test might give you a better idea if the problem really is with the rings or not.

I suggest changing to a heavier "high mileage" oil first before you start trying various brands of "snake oil".

 

Yea... Those super tiny increases in MPG tore open the envelope they were pushing... The irony of course is they'd have way better MPG had they opened up access to their source code and let thousands of coders write their firmware that you could flash all your ECU's with. That's why open source programming like linux became the backbone that the internet and our phones run on. But they put capitalism and an inflexible and under-staffed design team in charge of doing all the coding in secret because the executive's salaries are more important that sending the vehicle's MPG soaring without using bad piston rings!

 

Many manufacturers have had the same issue. Volvo’s VEA diesel for instance, which came out couple years after this Prius engine of ours. They tried to meet latest emissions standards and maximize mpg, played with low friction rings, egr etc. Turned out to be oil burner (+lots of egr issues) so they changed rings exactly like Toyota did. They also revised egr cooler and circuitry. Before fixes were implemented many engines got toasted. Sometimes twice because folks did not pay attention dpf that was clogged due to massive oil burning. So car tried to burn dpf open, oil got diluted, new engine started wearing rapidly and again oil consumption skyrocketed

 

Yup, fixing the symptom, not the cause.

(What's "dpf" by the way, typo?)

 

Diesel particulate filter. But i hear latest gasoline engines can also come with that filter. Some high mpg tiny gasoline engines can produce even more particles than diesel in cold weather (upon startup)

 

Direct injection does that, whether the engine is "tiny" or not.

 

I've heard specifically about fuel getting into the engine oil in Honda's CRV: 1.5 liter, turbo-charged and direct-injected. Some Civic's similar?

 

It's (mostly) the same engine.

Some DI soot particles go out the exhaust, and some into the oil (along with the fuel you mentioned). That's in general, not limited to Honda.

 

I bet a scholar somewhere has written a book about the history of piston rings... I bet there's some pretty hilarious stories over the centuries? Just looked at wikipedia... 1825 was the first proper piston ring: https://en.wikipedia.org/wiki/Piston_ring

 

Different case. Diesels have so called regeneration process, which means fuel is injected such way that some of it end up to dpf. It burns there to clean. Unfortunately some of that fuel slip past piston rings diluting oil. Regeneration happen every now and then (e.g every 300km) and if dpf is too clogged it happens constantly.. Some cars need new dpf every 120kkm as regular maintenance, some last ”forever”

 

Interesting. Diesel Particulate Filters are somewhat akin to a Catalytic Converter, albeit with a filter element that can be replaceable.

 

Any more info on this product ?