Been cruising around the mazda 6 forums. Apparantly the oil filter on the 4-cyl versions use a cartridge type and not a spin on. It requires a special too to remove the cover to access the filter. The cover is made of plastic and can crack easily, causing fast oil drainage of the engine and ruining it instantly. Since my car isn't here yet, I was wondering if anyone on this board has the 4-cyl, and if they could take a look to see if ours has the spin on or cartridge. The mazda 3 has a spin on though, and many 6 owners are converting their cartidge to spin on using the parts from the 3.