So I change the oil in my 06 TJ 4.0L every 3,000 miles and for the last 1,000 or so before changing it is so black it looks like it has many, many more miles on it. Jeep sees mainly highway miles and not much idle time at all. I don’t remember any of my previous TJ’s turning the oil this dark. Jeep has about 70,000 miles on it and I’ve owned it for the last 10,000 or so. Not sure of the PO’s maintenance. Oil used is Rotella 15W40.
Is this normal and I just didn’t notice it in previous Jeeps?
Is this normal and I just didn’t notice it in previous Jeeps?