This oil filter cover, reference number 0BH325159B., is a direct fit replacement component manufactured to original equipment specifications for Audi B9 platform vehicles equipped with the eight speed 0BH automatic transmission, commonly found in Audi A4, A5, S4, S5, Q5, and SQ5 models from 2016 onwards. As the sealing lid for the transmission oil filter housing, it secures the filter element in place while maintaining system oil pressure and ensuring that all transmission fluid passes through the filtration media to remove wear particles and contaminants. Constructed from high strength aluminium alloy with a premium carbon grey anodised surface treatment, this cover offers superior corrosion resistance, excellent thermal dissipation, and enhanced structural rigidity compared to the original plastic component, which is prone to cracking and warping over time. The precision machined threads and O ring sealing groove are produced to exact factory tolerances, guaranteeing a leak proof seal when installed with a new sealing ring and tightened to the specified torque. This aluminium upgrade eliminates the common failure point of plastic covers that deform under high temperature and pressure cycles, leading to fluid leaks and insufficient filtration. Symptoms of a failing cover include transmission fluid seepage around the filter housing, erratic shift quality, or dashboard warnings related to transmission pressure; replacing with our unit restores proper filtration efficiency and protects the valve body and torque converter from debris induced damage. Every cover undergoes 100 percent dimensional inspection, thread verification, and pressure integrity testing at 10 bar prior to dispatch. The material meets OEM burst strength and thermal cycling standards, ensuring long term durability even under aggressive driving and towing conditions. Backed by a 24 month warranty against manufacturing defects, this aluminium transmission oil filter cover offers workshops and individual owners a durable, cost effective solution that maintains your B9 transmission performance and extends service life. Installation is straightforward with standard hand tools and is strongly recommended during routine transmission fluid and filter change services.