Isn't your Iron a little high? I think I would change it for sure, but I may not know what I'm talken about though. Out of all my samples taken, I have never seen over 15ppm in the Iron department. I also have never ran my oil that long though. I'm just asking, not telling you. Thanks

 

36 ppm of iron in over 10,000 miles isn't a big deal at all. Universal average is something like 24ppm at 6400 miles. I can't believe the tbn is still that high...? Seems like you can run that oil forever... but I wouldn't.

 

Iron or anyother wear metal will increase will additional miles. Take 36ppm / 10671 miles. It would come out to 3.37ppm per 1000 miles. So with alot people who drain at 5000 miles it would equal 16.85 ppm of iron. This not bad considering all of the cold starts that the engine has been through this winter.