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Results of a 6 month/9K UOA a couple of weeks back were great, other than high Si and slightly elevated Na (road salt). The UOA can be found here: UOA The lab as well as others here on BITOG suggested that I check out the air induction system. As far as I could tell, it was airtight from filter...

This UOA was done after 6 months of mostly highway commuting. Filter was a Fram X2 and the car had about 62400 miles when the oil went in. No makeup oil added during the OCI. CONTAMINATION Silicon 31 Potassium 0 Sodium 1.6 Fuel % Glycol -- Water % Soot % -- Sulfation 90 Nitration 90 OIL...