The Fuel Injector O-Ring of BMW Z3 M prevents the pressurized fuel from leaking outside the injector path. Thus, it enhances reliability and ensures a clean combustion. The Fuel Injector O-Ring is made from fuel-resistant rubber. It sits between the rail and injector and has just enough flex in it to seal against the surge of modern pump pressures in every Z3 M. This is core BMW quality. The early Z3 M roadsters that use moderate multi-port systems have the same Fuel Injector O-Ring design as later high-pressure coupes. Clearly, the brand selected this O-ring because it is timeless and still drops right in with no special tools needed. Per cylinder, there is one upper Fuel Injector O-Ring and one lower Fuel Injector O-Ring designed to keep gasoline from the heat of the engine. In addition, they prevent vapor from leaking into the catalytic components and the passenger cabin. As the Fuel Injector O-Ring expands and contracts, the high-grade compound will not harden. As such, a quick visual inspection during normal BMW service can prevent rough idle or fuel odor. Drivers praise the part for delivering racetrack steadiness on their Z3 M while costing less than a tank of gas. That's great value and peace of mind for any BMW owner. The compatibility remains extensive, covering each and every BMW built Z3 M from the first 1998 S52 powered roadster to the last S54 coupe. The reason for this is the unchanged injector dimensions and the enduring Fuel Injector O-Ring profile. To protect against fire, the Fuel Injector O-Ring stops atomized droplets escaping the injector from reaching hot block surfaces. It is a mission-critical detail but one many owners ignore. When they replace them, confidence is restored. Simply weighing mere grams and trusted on every Z3 M that came off the assembly line, this affordable and unobtrusive Fuel Injector O-Ring can only further enhance mpg figures and assist in ever cleaner emissions while you enjoy spirited steering sessions counting down the kilometers in a classic BMW cockpit.
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