This is my first oil/filter change after two full auto-rx treatments by Frank's guidelines. I ran Castrol 5w50 Syntex for 5,000 miles and changed oil and filter. I took the filter apart and found gunk just like when i was doing the Auto-rx treatments. bits and pieces in the filter grooves.
IMO, this looks like stuff is still flushing out of the engine.
IMO, this looks like stuff is still flushing out of the engine.