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Old 11-16-2012, 01:22 PM   #5
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That's a good-looking UOA.

Just two comments:

kam327 posted a UOA a few months ago for oil in use about 5,000 miles following an initial drain and fill at about 1,500. So very similar to yours. Kam used conventional Pennzoil. Wear metals from Kam compared to yours are:
Iron 13 (yours 9), Aluminum 5 (yours 4), Chromium 1 (yours 0), Copper 7 (yours 5) and lead and tin 0, like yours. The TBN was considerably lower at 3.9. The point is both are excellent results and indicative of great wearing engines, suggesting all modern oils do a great job. The differences between the two of a couple parts per million is insignificant, especially given different analysis labs were used and driving conditions probably differed.

Regarding TBN, oils start with different levels. Amsoil SSO, which is intended to be an extended drain oil probably starts with a Total Base Number of about 12. Motorcraft, which is not an extended drain oil probably starts with a TBN around 8. So both oils are doing exactly what was intended.

My conclusion from all of this is that it's easy to over think the oil thing. Any modern oil used with a sensible drain interval will likely allow the engine to far outlast the rest of the car, unless it is driven in truly extreme conditions.
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