The BMW 128i Coolant Reservoir Cap maintains the cooling system sealed, pressurized and prevents heat spikes that could damage engine power. The Coolant Reservoir Cap is trusted for its dependability as it will hold factory pressure and vent only when necessary and reseat to ensure optimum coolant volume is maintained. The Coolant Reservoir Cap features a calibrated spring valve that is designed to combat air bubbles, minimize rust and overflow messes. This cap has benefited every 128i produced and also supports the lively inline six that has always had BMW enthusiasts cheering. The metal units on early cars and lighter plastic versions on later ones share the same threads, so one Coolant Reservoir Cap fits any coupe or convertible 128i from 2008 through 2013 without adjustments. This simple interchangeability boosts customer confidence and shows BMW focus on long term reliability. The Coolant Reservoir Cap ensures even temperatures and prevents toxic glycol from leaking onto roads by securing the fluid, which helps the 128i deliver strong mileage and quick throttle response. The part also increases safety as a tightened Coolant Reservoir Cap will contain any sudden release of steam, which could obstruct vision or damage wiring. The Coolant Reservoir Cap provides an easy twist-lock installation, is made from chemical-resistant materials and is pressure rated for sporty driving. Of all the available options, nothing offers every 128i owner an affordable way to help protect their BMW. Having a spare one in the glove box helps keep the 128i cool during road trips to ensure that true BMW performance never fades.
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