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If you have an early model without the Teflon coating it is recommended to replace them with the updated version even if there is no scoring
Highly recommended for '99 model year engines
Fits all models -
S50 ('95 M3)
NEW Upgraded DISA Valve Engine Type:M54 3.0l / M56 2.5l If you have an earlyThe DISA valve is a common failure on the M54 and M56(ULEV) BMW engines and is caused by the poor materials used in the manufacturing process. The three parts of the DISA are the flapper valve, the bell crank lever that rotates the flapper, and the vacuum pot, all made of glass reinforced nylon. This construction of glass and nylon is what primarily creates failure points. The symptoms of a worn DISA valve include rough idle, lean engine codes and