BMW call for 5/30W synthetic engine oil with very long oil change intervals (for piece of mind I like to change it more frequently. The engine oil drain plug is at the bottom of the oil pan and the oil filter is a paper element cartridge style filter, not a conventional spin on oil filter like most cars. The oil filter housing is either on top of the engine with a large nut cast into the top of the filter housing that you use to unscrew the top off to get access to the filter or may be at the bottom of the engine next to the oil drain plug. Hopefully someone with BMW experience will see this question and respond.