What might cause bmw 118d oil leak?

Oil leaks in Your BMW 118D can be typically caused by wearing out one of these valves or seals; however, leaks may also occur due to common mistakes such as not securing the oil cap enough or tightly plugging the oil pan gasket after an oil shift. The above is a frequent source of oil leakage from the lower engine field. The most typical place for engine oil to leak is out of any seal or gasket, including the valve cover gasket, timing cover gasket, front crankshaft seal, rear crankshaft seal, or oil pan gasket. You will have to find and pinpoint where the oil is leaking from so You can open the hood and look around the engine components to see where there is potential leaking oil. There is no easy fixAs for most of the time You will need to replace a damaged part.