Improper VANOS function will cause reduced power and poor fuel economy. The VANOS system is BMWs version of variable valve timing and can be found on the intake and or exhaust camshafts. The system uses a pair of electrically actuated solenoids that direct the flow of pressurized oil to the VANOS gears. Depending on engine requirements the VANOS system can advance or retard timing as requested by the ECU.
Leaky valvetronic actuator gaskets are a rite of passage for modern BMW owners, but they don't have to sideline your ultimate driving machine. When that factory seal gets brittle from track days and daily commutes alike, oil starts weeping down the valve cover, creating a mess and potentially fouling critical sensors.
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