Originally Posted by DN1911
also, 2009 Mazda RX-9 filters are made by the same japanese company that made the old black filter for subaru. i read somewhere that it fits and is a little deeper filter for more capacity
Purolator made those black filters for subaru at one time as well. After spending a long time researching for the best oil filter, I ended up with PureOnes. Many people swear by it on BITOG forums, there were also a ton of comparison tests against all the filters you can get at your local auto stores. The P1 has a very dense filtration medium, as well as a high flow rate. Its overall design is top quality. You can get them at a pepboys for about $5.24ish. Use it with Rotella T6 5w-40 and you are good to go!