I recently changed the oil on my 2011 Frontier. I used a new style PH7317 filter. I started the truck after it had been setting for 2 days and heard an obvious start up rattle. I let the truck set for another 2 days and got the same start up rattle when the truck was started. This was not a problem when the truck was restarted several times on the same day. I had another PH7317 on the shelf so I installed it. After letting the truck set for another 2 days with the replacement filter, no start up rattle when the truck was started.