There is a special radiator in BMW X6 cars which controls oil characteristics. During service you need to get X6 factory sizes for 3.0 engines. If the oil radiator is broken in BMW you should use these sizes: 95 mm height, 64 mm width and 50 mm depth. With the help of it 3.0 engines having model number N55B30A get normal liquid temperature. For BMW X6 3.0 only such radiators are installed.
The best decision for BMW of 2009 year is to buy factory parts. To ensure optimal oil cooling choose this radiator: 95 mm in height, 64 mm of width and 50 mm in depth. The module in N54B30A motors with volume 3.0 can be easily out of order.