Common Oil Leaks on BMWs

Leaks from the valve cover gasket are common in many BMW engines. Valve covers sit at the top of the engine to protect the valves and rocker arms. The covers are bolted to the engine and sealed by a cork or rubber gasket. Leaks or seeps can occur even with a new valve cover, but are more common on older cars. According to RepairPal, valve cover gasket leaks are common after 60,000 miles. Applying sealant can sometimes fix the problem, but it is best to check with a certified mechanic.

Many BMW engines feature an oil pan that allows for easier access for engine repairs and overhauls. However, it is common for the gasket on the pan to leak as the BMW ages. Replacement will require removing the car’s front suspension.

It is common for the rear main seal on a BMW’s engine to leak. According to members of the BMW Car Club of American, rear seals fail when there is too much wear on the crankshaft and the lip is unable to control the output of fluid.

It is common for oil leaks to occur in older BMWs when drivers use synthetic oil in the engine. This is generally due to older seals, which tend to leak with synthetic oil. Pelican Parts recommends that drivers use non-synthetic oil in older BMWs.