So. The Dodge manual says to change the oil and filter in my 5.9l every 3750mi. Yet I've read that Cummins suggests 15k mile intervals. Barring the use of the Amsoil bypass that I'm researching, which do I believe?
I recently changed the oil and it was pitch (tar) black. In my gasser, that would be a warning sign to me that a) the oil had been in the engine too long or b) that something was hosed (or becoming so) internally. What about on the Cummins?
Oh - and to speak to the recommendations for getting the oil sampled instead of just blindly changing at some mileage / hourly interval, does the community have a preferred facility?
Thank you!
I recently changed the oil and it was pitch (tar) black. In my gasser, that would be a warning sign to me that a) the oil had been in the engine too long or b) that something was hosed (or becoming so) internally. What about on the Cummins?
Oh - and to speak to the recommendations for getting the oil sampled instead of just blindly changing at some mileage / hourly interval, does the community have a preferred facility?
Thank you!