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The solenoids gradually become contaminated with foreign debris circulating through the oil and will slowly degrade
Prevent Catastrophic Cooling System Failures
causing poor engine performance
then your timing may be slightly off
These are Genuine BMW sensors
S85 Helical Pump Gear s54 The solenoids gradually become contaminatedUpdate your early model (up to 12 05) M5 or M6 vanos pump gear with this later version when rebuilding your vanos oil pump. The updated gear has a redesigned tooth profile to address failures in the early versions. Note: You will also need the updated crank hub helical gear with this item if converting from the older version. It's also recommended to update the pump chain guides as well.
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