As a matter of fact, Filtration Solutions asked us to monitor our oil by taking samples of it and having it analyzed by an independent laboratory every 10,000 miles. Lab analysis reports say that synthetic engine oil lasts as long as 50,000 miles while maintaining minimal amounts of contamination or molecular degradation.
However, to maintain this level of filtration, the filter element needs to be changed every 10,000 miles. Filtration Solutions also says you should change your spin-on filter once a year. A filter element costs $27, versus changing your oil and filter at $76 (Rotella T Synthetic).
The FS-2500 kit costs $429 to $759, depending on the application.