I bought a set of aluminum valve stem caps with BMW roundel logo on it for my wheels. They've been on there for about 1.5 years now and today when I tried to check the air pressure (haven't checked in about 9 months) none of the caps will come off!!! (all 4 tires)
I tried to use a wrench, and spraying some WD-40 but they just won't budge! Any suggestions on how to take them off? my tires are a little low on air (visual inspection).