must be normal for bmw's. i've had the system pressure checked at the dealer which they said was ok, so did my indy shop and I still have to add about a cup of coolant every 3 or 4 months or so. my indy shop said that bmws tend to evaporate the water out of the system, not so much the coolant, so when you top it off to use just water.. I still top mine with a 50/50.
It takes a big man to cry. It takes an even bigger man to laugh at him-- Jack Handey
mods: blackout grill, finishing rods, badges, Blacklines.