LN Engineering's exclusive full-flow spin-on oil filter adapter allows for use of a conventional spin-on oil filter, rather than expensive and messy cartridge-style filters, and improves oil filtration by eliminating the problematic factory filter bypass that can allow contaminants back into your engine. The LN Engineering Spin On Oil Filter Adapter is a must on all engines as foreign object debris from IMS bearing wear or failure can cause collateral damage in the engine, especially as the factory filter cartridge bypass gets weak over time and allows the stock filter to run in bypass. This allows debris to exit the filter and contaminate the engine. The spin-on oil filter adapter utilizes a Napa 1042 / Wix 51042 (sold separately) rated for 9-11 GPM with 21 micron rating (versus 28 micron rating for the factory oil filter insert) and full-flow filtration (no bypass valve). Uses filter housing o-ring part number 996 107 313 51 (o-ring is included with spin-on oil filter adapter). Replaces Filter Cartridge part number 99610702055. 26mm socket required for installation; torque adapter to 25 Nm (18 FT/Lbs). We also recommend using FilterMag's SS300 filter magnet to further improve oil filtration.