Oil Analysis report. 2004 prius 47K miles

Why did you run "15W30" or was that a typo by the lab?

 

Thanks for posting the analysis, Scott. Did you run a single oil filter that entire 12k miles, and was it the Toyota product?

I have used Mobil synthetic (not the new extended product) for this long, but always so far with a filter change (and a bit of top-up oil) halfway through.

You did have more Al and Fe than we have usually been seeing in Prius, but not much more - I would not get to excited about it yet. I would look at the air filter, as they suggest, but again the number is not that much different. If they advised me to go to a shorter oil change interval, I'd do it.

Note that their "universal averages" represents all of the Prius that Blackstone has done, using Mobil synthetic oil.

 

Wow, it's cool that you can run 12k miles between oil changes. Will be interesting to see. Hopefully you won't have to change the air filter this time (or do it in a cleaner env). If this works I'm thinking about doing the same for my car.

 

You probably should try dropping the oil change mileage to 7500 between changes and then retest the oil, to see if your wear is less evident with the shorter time frame.

 

Scott:

Given the interval, those values are still very reasonable.

Even minor amounts of dust from an air filter change can dramatically increase engine wear. I always use an air hose to blow off the entire area around the filter before removing the filter box cover.

I'm wondering why the Toyota tech didn't do that. Oh right, it wasn't his car, that's why.

jay