BlackStone Oil analysis result
 

Recently I did an oil analysis for my car since it has gone 7 months and close to 7000 miles since the last oil change at the dealership, I'd like to share my result with everyone as a token of my appreciation for this community.

2011 3.6R
Subaru Syn. Oil: 6916 miles
Engine: 21675 miles

They said everything looked normal, and TBN showed that the oil can go 8k.

http://img266.imageshack.us/img266/9595/capturetp.jpg

Your iron looks high to me. I could be wrong though. Mine was at 5 and yours is at 21. The average for the engine is 12.

Could that possible come from wear on the cylinders?

The viscosities and oil specs look good. Do you drive fast? It could be from the cylinders.

No, pretty average overall.

Don't mean to freak you out because my iron totals on another car jumped up when the turbo went bad. Looks you have a six, so thats not the problem and you aren't as high as mine were (40 iron count). Blackstone checks a lot of engines and when you are almost twice the average for the engine, something could be wrong. I would run another oil analysis at the next oil change and see if that was a one time deal.

They said the following in the comments box:

"Universal averages show typical wear levels for this type of engine after about 4,500 miles on the oil. You've gone longer than that already, and your wear is still in the average range, so you'd have no problem running more miles on this fill, We do usually recommend changing it when the dealer says to while you're under warranty, just to avoid warranty problems if anything should come up. Not that we expect anything to--this should be a terrific engine for you"

I usually change the Subaru syn. oil every 5k, this time I want to push things a little bit so I went 7k.

There you go. You are good. Guess the Subaru six runs twice the iron count of the universal averages.
:)

The numbers look great! A TBN of 3 means the oil's additive pack is holding up well. That oil would probably hold up @ twice that mileage.

Copper, lead and tin are super low, so that indicates no excessive bearing wear.

Potassium is low so there's no head gasket/coolant leaks.

Silicon can indicate poor air filtration.

Joel

Yeah guarantee that if you shortened the interval the iron count would go down a bit.