I only change out my oil annually, since I've only put 3,000 and 5,000 miles on the car in the last two years, respectively. The first Blackstone Labs analysis I had done was when I first came to own the car, and my records indicated it had conventional "CarQuest" 10W30 oil.

After that initial report, I switched to Mobil 1 European Formula 0W40. It probably comes as no surprise that the metal contents of the sample were much reduced this time around. The additives were significantly higher, except for sodium. I used the standard Mann oil filter on this one.

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