I am just confirming the condition of my engine and that I am good to go with 15K oil changes. If there was something suspicious I would have the Dealer take note of it so it's on file.
The TBN tells that there is a lot of life left in the oil. Someone else may chime in as I am not an expert! So for me doing an oil change at 15K and knowing it's ok top do so in reality saves me time and money even using a more expensive oil. Look at the viscosity numbers and the flashpoint, the oil is still in great condition. But like they say it's best to stay with the 15K as long as I am under warranty.
When I did an analysis on the rear diff fluid it showed it was BAD, yes I went over mileage but it showed their original fill was not a quality synthetic IMHO.
The TBN tells that there is a lot of life left in the oil. Someone else may chime in as I am not an expert! So for me doing an oil change at 15K and knowing it's ok top do so in reality saves me time and money even using a more expensive oil. Look at the viscosity numbers and the flashpoint, the oil is still in great condition. But like they say it's best to stay with the 15K as long as I am under warranty.
When I did an analysis on the rear diff fluid it showed it was BAD, yes I went over mileage but it showed their original fill was not a quality synthetic IMHO.