Here is my latest oil report from Blackstone labs. They are good to work with, and quick on the results. I have filled the car with straight #2 diesel for about 85% of the fill ups when and where possible. Not much idling to speak of, but some city driving and short trips for sure. I have one more oil change left at 30K from V.W. then on to something different for oil changes. I might try Amsoil 5W30 Euro or stick with the Castrol if it stays good on the next report. If anyone is using something different with good results on this engine please let me know. Any recommendations and comments appreciated.