i have a 1987 bmw 325i and latly my car has been making sounds when I turn the wheel. i have put fluid back in it and it solves the problem for a day or so. i took it to an auto zone and a guy said there that i have water inside it. i just figured that i had a leak and that i'll fix it when i get back home. is this a normal issue w/ BMW's? i'm just wondering if there has been any recalls or any way i can fix this problem w/o buying a whole new pwer steering system?