1990 525i big problem??

[atv087]

I have to put about 5 quarts of antifreeze in a day there are no puddles underneeth the car. and it does not smoke out of the exhaust like it needs a head gasket. also it burns about 5 quarts of oil a week. the radiator does not have a leak and today i was driving for about 20 minutes after i refilled it and the low coolant came on and i pulled over right there and refilled and got home and it was empty again. all the hozes coming off the radiator are new. any ideas what these 2 problems could be???

and also if anyone knows how to put in speakers and could give me an idea on how hard it would be please let me know

thank you
jason