That is what I was thinking until I read the post about the HEAT of an aircooled engine is what was breaking down and "browning" the conventional oil he was using.
But otherwise I agree - the only oil I've seen come out of engine looking clean was nondetergent that had sat for a while. All the dirt has settled out of the oil and was left in the engine. If anything on my cars real synthetic oil comes out blacker than conventional oil - I like to think its because its cleaning it out.
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