Oil Filters/Synthetic Oil
I have just recently purchased an 06 GTO and have worked in the auto parts world for the last 15 years. I wanted to clear up some of the myths regarding different brands of oil filters. Last time when the WIX representative came into our store, I had him cut open every brand and type of filter we sell to compare their internal differences. From what I've seen, I will never use a Fram of any grade or anything cheaper/generic than Fram.
All 3 versions of Fram XG, TG, HM filters and our house brand made by Fram used about half the pleats of filter media than the other filters. Also, disturbingly, they are the only ones to use cardboard top and bottom caps on the filter media which are cheaply glued together. Some of them even had areas where the glue didn't fully seal and you could see right through the filter. Their bypass valve was very cheap rubber and the spring at the top was a cheap piece of stamped steel. When cut apart, their cases feel flimsy and thinner than the others.
The AC Delco, Motorcraft, Bosch, Mobil 1, and K&N all had many more pleats that were tightly weaved and used steal top and bottom caps. Their bypass valves were much more pliable rubber and won't dry out as quickly from heat and time. They still all used the stamped steel spring but was of higher thickness.
The WIX filter is the only one to use a dedicated anti-backflow valve, and a steel coil spring instead of the stamped steel one. They also had the tightest pack of pleats of filter media. They are also about half the price of the K&N or Mobil 1. The only thing that really makes the K&N stand out is the fact it has the 1" nut on the bottom for easier removal on some applications and the case is thicker than the others for higher burst strength in extreme high performance applications.
In my opinion, run the slightly longer WIX 51522 or if price don't matter use the Mobil 1 M1-206, K&N HP2006 or the Amsoil EAO64. The extra filter media will increase efficiency and flow rates slightly.
Hope this helps, Greg
Last edited by 68greengoat; 05-03-2013 at 09:32 AM.