The K&N 33-2400 is a reusable, pre-oiled panel air filter for the 3.2L L6 gas engine in the Volvo XC90. The manufacturer describes its layered, oiled cotton gauze media as designed to improve airflow while capturing contaminants, and it drops into the factory air box with no modification. Owners who want a washable element in place of a disposable paper filter get a filter rated by the manufacturer for up to 99% efficiency, with a no-hassle lifetime limited warranty. Searches for a 33-2400 XC90 3.2 drop-in filter, a washable XC90 engine air filter, or an XC90 3.2 L6 intake filter upgrade usually lead to this part. Gains over a stock filter are modest, so a buyer should expect a cleaner, reusable filter rather than a large power change.
Fitment should be confirmed before ordering. The manufacturer's product page lists the 2007 to 2014 XC90 with the 3.2L L6, while its vehicle listing also shows 2006 applications. The manufacturer recommends cleaning the element about every 75,000 miles under normal highway driving. Owners on user forums warn that oiled K&N-style filters can contaminate the MAF sensor, so over-oiling should be avoided and the filter should be cleaned and re-oiled with care.
The manufacturer's product page lists the 2007 to 2014 XC90 with the 3.2L L6 gas engine, but its vehicle listing also shows 2006 applications. Confirm your exact year and engine with the manufacturer's fitment lookup before ordering.
The manufacturer says the filter needs cleaning about every 75,000 miles under normal highway driving conditions.
The manufacturer lists a re-oiling amount of 1.15 oz (34 ml) for this filter.
Owners on user forums report that excess filter oil can contaminate the mass airflow sensor on XC90 engines. Use the manufacturer's cleaning and oiling method and keep oil off the sensor side of the airbox.
This is a drop-in swap. Remove the airbox lid, lift out the old paper element, wipe out any dirt in the housing, and set the pre-oiled K&N in place with the airbox seated evenly. Owners on user forums describe the XC90 airbox lid as held by several latches or clips, and fastener type varies by model year, so check your lid before you start. Fully reseat the lid so it seals, and avoid touching the MAF sensor while you work. Confirm the steps against the manufacturer's install sheet for this part number.
