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Synthetic Oil

Hello Folks!
I'm sure this one's been kicked around before, but here goes...
I've used Castrol sythetic oil for the past several years with good 
results.  When I used regular oil, I changed it every 3,000 miles 
because that's about how long it was supposed to take for the 
lubricating properties to break down from heat, pressure, etc.
Now I change the oil/filter every 5,000 since the synthetic stuff never 
breaks down and looks about as clean after 3,000 or even 5,000 miles as 
when it was new.  (Some synthetic oil manufacturers claim you can leave 
it in for 15,000 miles or more but that seems a little much.)
My question is:  Does anyone know (or think, or just plain guess) any 
long-term reasons for not using the synthetic stuff in my Bimmer?

TIA (which also means ti-active, i.e. 318tia   :) )

D. Stephen Metz
Portland, OR
Two (2) Alpine White 318ti's