My car seems to loose 1/2 inch or so of every 3 to 4 weeks. I've recently seen dried coolant spray on the side of the air filter box and alternator duct. I've always been able to smell a faint hot antifreeze scent from the front of the car when it's parked. My old 87 325 had the same "odor" but I never had to replace much of the cooling system as my 525 has required. Last time I pulled the plugs the color was fine except for a slight bluish spot at the end of the porcelin tip...not a good sign in my opinion. I just keep a close eye on the temp gauges, coolant levels etc. Head gasket is on my list and keep my fingers crossed it doesn't let go before I can replace it...gotta get that cam tool set soon.
JR
1992 525 IA, EAT chip, 16 x 7.5 Rondell 58's, BavAuto Springs, Bilstein Sports, Elipsoid Smileys & fogs, Z3 Pistol grip shifter, 4 VDO gauge package, Azure Blue w/nice patina - clearcoat shot