.boB, thanks for sharing that with us. Good info even for those guys using different oil and not changing it as often. How much did this spectro anyalisis cost?

 

a complete analysis with the TBN costs $32.50. They send you a free kit(s), which includes mailing container and instructions. They send the results back by e-mail. They will do snail-mail if you want them to.

http://www.blackstone-labs.com/