When operating efficiently, the cooling system can be your best friend. But it can be your worst enemy if you do not know how it works and how to maintain it. Every component of the cooling system including the radiator and expansion tank should be regularly and properly inspected to maintain its efficient service for a long time. Your BMW 528E has one or two radiator expansion tank cap in it. This functions in keeping the coolant from leaking and damaging the engine parts. However, most of the time many motorists ignore their BMW radiator expansion tank cap. A radiator expansion tank cap with a cracked or worn out sealing won’t help much in keeping your cooling system fully functional. This could result to overheating that can be potentially dangerous to the engine components. As soon as you notice coolant loss or smell of antifreeze when you park, immediately check the caps. When replacement is needed, do it as soon as possible. Get only the best in radiator expansion tank cap technology to ensure superb functionality. Trust on Germany radiator expansion tank cap to give you only the best in coolant seal. Depending on the application, the product may be used as a radiator cap or expansion tank cap. Germany BMW radiator expansion tank cap is made from top quality materials that offer long service life. Visit us on your next BMW Germany radiator expansion tank cap need. Our comprehensive online catalog carries top quality Germany products that you can depend on for a safe and powerful driving.