I have to respectfully disagree on several key points.
One-if you read that someone ran 200K on THE SAME OIL and they say the engine was fine and the oil was clean and fine, they are simply lying. I bet they DID NOT do an oil analysis on that oil.
Even the staunchest supporters of synthetic oil would laugh at this claim. As I said, AMSOIL is the most agressive oil maker out there and they say, 25K or one year. They acknowedge that even their oil picks up contaminents, degrades and loses it viscosity, albiet more slowly than dino oil.
Two-I have used SYN for years and love it. As stated, when I drain the oil from my Buell, it is BLACK after 2500 miles. There is particulate matter in the oil that I am very happy to get it out of my engine and trans.
In my Porsche's it is BLACK after 7500 miles.
So, I am not in the 3000 mile club but I can tell you that for a few bucks extra, I am NOT subjecting my 12K engine to the any extra risk when MY money is on the line, I don't recommend the 15K to my customers either, simply because most of them would have to pay if the engine goes bye bye!
I love oil threads!
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