05-04-2016, 05:55 PM
The thread "Rotella T6 in an 8V92" in the "Drivetrain" forum on this site contains the record so far. I will be testing the oil again this fall and plan to change it at that time. I have added 2qts more oil. I believe almost all usage is due to a small oil leak that has been present since I've owned the coach.
Jon Kabbe
1993 coach 337 with Civic towed