Finally got close to 20K on the XG3600 Ultra on the xB in my sig, the first OCI was almost exactly 10K on M1 EP 5W30, the 2nd OCI was 9600 miles, same oil. I'm getting a little fuel contamination, oil smelled a little like gas & was thinning out, there was a little more valvetrain noise hot than usual. Second picture is after drying the element out a little. Personally, on a clean engine, these could almost be used indefinitely, other than a little carbon, there's basically nothing inside, at all.
https://www.dropbox.com/s/q73hvudkxo6jaji/XG3600-1.JPG?dl=0[/img] The date code is A23243, believe that's Nov. 19th, 2012, it was on for a little over a year, roughly around 15 months. Couple years in the stash didn't seem to hurt it any.
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