Here's some pics and text posted by "papaseven" that shows an HD filter cut open.
They came off of my 03 RK with 3500 miles on this oil filter. It is a #63796-77A filter that is used on the EVO motors with a nominal 30 micron rating
This filter was bought new from dealer on 10/3/08 and installed same day.
Good quality parts with no internal corrosion, Dedicated relief valve, Nitrile lip seal between cartridge and flange "tight fit on cartridge means no dirty oil can bypass", heavy gauge flange with no burrs, coil spring instead of inferior stamped spring, and what appears to be a standard pleated paper element with metal end caps and metal tube inside element.
Notice the large gap between cartridge and end cap. "good thing". This means it has plenty of room for a large volume of oil to flow with no restrictions.
I took this filter to a friend that owns a company that sells and rebuilds hydraulic pumps and motors. They are a certified dealer for most major brands of hydraulic equipment. He was able to test it on his machine for flow rate before I cut it apart.
It was flowing 40wt hydraulic oil at 7gpm which means it would probably still not be bypassing at 10,000 miles.
I'm not saying you should run one that long but it was comforting to know that I could go 5000 between changes if I wanted to.
This was not the 10 micron filter!! I don't use them because I feel they will not flow enough oil. That's just my personal opinion and is based on nothing but my hard head.
I tried twisting the endcaps and was unable to by hand. The adhesive used was evenly applied with no excess to break loose.
Looks very similar to NAPA and Wix filters that I have cut apart before. Probably made to MOCO specs by Dana/Wix but I can't say for sure.
Is it worth the extra money over a NAPA, Wix, or Purolator. You'll have to decide that.
It is made the way a filter should to be made with no cheap parts and clean assembly.
Linear Mode
