Wow!... this has stirred quite a hornets nest just like it did on priuschat. Funny how people protect paradigms of thought as if its their own identity at stake... "my dad is stronger than your dad"
Anyway, I have included the original report just to show its not just numbers put on a page.
As discussed in detail on the other forum, warranties are "suggestions" based on the weakest link. Some drive on hot dusty dirt roads and others never leave the pavement.
Aside from that, I was possibly naive in jumping to 25K so quickly... While I know this is not an indicator, I kept looking at my oil stick and the oil looked great!
In all fairness, yes a prius does not have the engine engaged for most of the coasting and braking time other than to be "revolving" on electric power expecting a quick recovery should the driver step on the gas again "helps make the experience seamless and is more efficient".
Only after the computer thinks the driver is settled does it actually stop the engine completely... this is usually at red lights etc.
Also, during the duration of 25K... there was some consumptive use..... I added 1/2qt twice to keep the level full, so that would tend to "freshen" the oil numbers too.
Its speculation to assume that would have been needed regardless of the oil used for that long of a duration, or whether it was due to the 0-30W being a tad thinner than recommended.
Living in texas with moderately hot temperatures.. I could have gotten a tad thin but according to the report.. not metals we high etc.
As far as silicon levels.. it was discussed as to whether the stock factory air filter was sufficient verses a leak "has a rubber seal all around" verses the sheer volume of air pulled in over a 25K mile run.
We do get lots of windy days and I'm sure lots of "silicon" is in the air.
Since there aren't too many other 25K reports out there to compare to.... I would venture to say that almost any report would be high due to the run time involved.
I guess the next question would be.. "does that silicon hurt and cause damage and if so is there a way to remove it or prevent it from reaching such levels?"
Maybe you guys can answer... this may be the weak link limiting long run times in my area.
Another factor that made me feel warm and fuzzy about trying such a long trial period was that the prius computer is pretty accurate at judging gas mileage and it never suffered.
In the past with other cars, If I ran the oil too long, I would get erratic idles and really [censored] gas mileage along with filthy looking oil.
None of which occurred with this 25K run.
I am new to synthetic, but as with most anything else I buy.. I did lots of research and tried to weed out the famous from the true and ended up with Amsoil SSO.
I have discovered that what sells is hype and image.
The government and politicians know it and so do crafty businessmen.
The "perception" of reality is often much more impacting than the truth because the masses don't follow the truth but rather the image and are easily led astray.
Amsoil just seems like a solid "no brag" company that seemed to mean what they say and say what they mean with a warranty behind it.
While I realize warranties are only as good as your lawyer in court, I just can't understand the logic in buying very expensive oil and tossing it before its half done with its life.... if you like lots of oil changes, might as well go with the cheapest.. it works too!
But if your like me and hate to mess with it and want a clean once a year fix, I think I've found the solution.
While its not in the comfort zone of others, it is what it is..... maybe I have too much faith.....or maybe I'm stupid.. but at least the oil report backs me and and even suggested I go longer next time!
Here are some pics...
Oil at 23K on the dipstick.
New Oil
25k OIL REPORT