Latest oil report on my '98 Dodge 24valve Cummins.
Mobil Delvac 1 5W-40
In service 10/17/03, drained and sampled 8/24/04
Miles on engine: 111,366
Miles on oil: 17,134
Oil filter: Fleetguard StrataPore
Air filter: Amsoil oiled foam
2 oil filter changes throughout the course of the interval, about 2 quarts make-up added.
Lab: Cummins PowerCare DePere, WI
Comments: All engine wear rates normal. Check for source of coolant leak. Drain oil and change filter if not already done. Resample at next service interval to monitor.
I'm suspecting the culprit for the coolant source may be the oil cooler. I have a sample sent to blackstone also, and will compare results. Cost of this lab report was $14.95 postage paid.
I have run 5% Bio-diesel fuel occasionally during the spring and summer. Otherwise I fill up with BP Amoco Premier 50 cetane diesel fuel. As of late, I've also been using Schaeffer's Soyshield additive, and Power Service in the past.