If you overfill too much oil into your Boxster engine it is damaging for the environment and for your engine. A too-high oil level can cause the engine oil to foam, which means that it can only partially perform its lubricating function. The foaming is caused due to the oil level being high enough for the crankshaft to whip the oil into a foam. At the same time, a greater quantity of oil mist is transported into the combustion chambers, only some of which will be combusted. This leads to deposits in the combustion chamber, reduced engine performance, smoke, and increased oil consumption, as well as uncombusted oil constituents in the exhaust flow reaching the catalytic converter, adversely affecting its long-term performance. This foaming of the oil causes a loss of oil pressure and inadequate lubrication. Regular oil checks show when and how much oil needs to be topped up.