@ARB1977 : Changing the oil soon is obvious and correct I guess, but bp possibly is more economical and possibly does a better job at keeping the oil clean, as oil even if new, contains some dirt by itself.
@ SteveSRT8 : Thanks for your answer. The problem is that I still can't get my head around how a better oil would do anything at all about dirt. A better filter, yes, it would help with dirt, or so I feel.
@ scurvy : I don't have a specific limit for "high miles". Whatever you think is important is acceptable. I am looking for some evidence that bp actually helps the engine. Thanks.