Explore 2009 Audi A4 Oil Filters. Purchase 2009 Audi A4 Engine Oil Filters Replacement & 2009 Audi A4 Engine Oil Filters. Discover Best 2009 Audi A4 Oil Filters. When selecting an engine oil filter for your 2009 Audi A4, it's crucial to consider the array of options from reputable manufacturers such as Mann, Bosch, and Mahle. Each brand brings benefits, with Mann filters providing exceptional filtration and longevity, Bosch being known for their high-quality build and optimal engine performance, and Mahle filters offering a balance of durability and cost-effectiveness. Compatibility varies, with some filters fitting the 2.0T variant exclusively, while others are suitable for the 3.2L model. Seasonal changes can influence filter efficiency, so it's wise to choose a filter that can withstand the viscosity changes in lubricants caused by extreme temperatures. Our premium selection ensures your A4 maintains its peak performance, regardless of weather conditions.