The K&N 33-2466 is a panel-style drop-in replacement for the factory engine air filter on the 6.6L Duramax V8 diesel in Chevrolet Silverado and GMC Sierra 2500 HD and 3500 HD trucks. It uses layered, pre-oiled cotton gauze media in a flexible frame, and the manufacturer describes the design as improving airflow while still capturing contaminants. Because it is washable and reusable, you clean and re-oil it instead of buying a new disposable paper element each service interval, and the manufacturer backs it with a limited lifetime warranty. The manufacturer says the filter is designed to help increase horsepower but does not publish a figure, and owners on user forums report mixed results, with some noticing no change. Buy it for reusable filtration on a diesel LML or LBZ-era Duramax intake, not as a guaranteed power gain. Search terms this filter matches: 33-2466 Duramax air filter, LML 6.6L oiled cotton gauze panel filter, 2500HD 3500HD reusable drop-in air filter.
Installation is a drop-in job into the factory air box. The flexible frame seats the filter without a housing change, so no intake modifications are needed. Owners on user forums warn that over-oiling can migrate to the mass airflow (MAF) sensor and trigger fault codes or reduced power, so apply a light coat of oil after cleaning and let the element dry fully before reinstalling. Keep the MAF sensor clean if codes appear. Cleaning intervals vary with driving conditions, so confirm the service schedule with the manufacturer before you set a reminder.
The manufacturer's application listing covers 2011–2016 Silverado and Sierra 2500 HD and 3500 HD trucks with the 6.6L diesel. Because the title on this listing references 2011–2012, check your VIN and engine against the manufacturer's fitment guide before ordering.
No. The manufacturer's application is for the 6.6L Duramax diesel V8 only.
Yes. The manufacturer describes it as washable and reusable. Follow the manufacturer's cleaning and oiling instructions, and avoid over-oiling, which owners on user forums connect to MAF sensor problems.
This is a beginner-level drop-in swap. Remove the factory air box cover, lift out the old filter, and seat the new panel in the box, making sure the flexible frame sits flat all the way around. Owners on user forums describe a locking cog in the air box that the filter must be turned past to lock in place, so confirm the element is fully seated and secure. Do not use compressed air to clean the filter, as the manufacturer's cleaning guidance warns against it. Let the element dry completely before oiling and reinstalling, and wait for any oil to set before you put it back in the truck.
