On BMW N54 engine there is a very common issue after 60,000 miles which is the valve cover gaskets begin to leak. This causes smoking from the exhaust pipe due to oil leakage from the valve cover. Also this could cause the engine to smoke due to the oil leak. This is an important maintenance requirement for the 335i BMW N54 engine after 60,000 miles. The above picture shows the valve covers which have been removed and the valve cover gaskets replaced. After the replacement we steam cleaned the engine so there is no further oil leaks and smoking issues. This will increase the life of the engine and also resolved the current issue.