Hi all, ok x5 takes the blue ethane1, 2-diol, this is what is on the bmw coolant bottle, now i can't get hold of this bmw dealers out here are shut due to holidays, and coolant needs more than just a top up...(dont ask why) can i get away without causing damage if i top up ALOT with the ethylene glycol based coolants/anti freeze that i can get from a gas station?