Quarter Window Weatherstripping (Left) - 2011 528i

The quarter window weatherstripping on a 2011 BMW 528i is essential for maintaining a proper seal and preventing water ingress. The OEM part number for the left side is 51337160112, which fits various models within the F10/F11 5 Series range from 2008 to 2016. When inspecting or replacing this component, check for dry rot, tears, or any gaps that might indicate failure. Installation typically involves removing the interior panel and carefully prying out the old weatherstrip to avoid damaging the mounting surface. Ensure the new strip is properly seated to avoid wind noise and moisture entry. Common failures include degradation due to UV exposure and improper sealing, which can lead to water leaks. Always verify compatibility with your specific model year and trim, as differences may exist, especially between different engine variants.