Please don't use the phram oil or fuel filters. They are made poorly and allow oil to carry over materials they should be filtering out. The motorcraft 1995 oil filter is the best filter possible for these engines. It filters down to a smaller micron that the idi filters because the psd fuel sysem requires a cleaner oil for the injection process. Their injection pressures are min at 20,000 lbs and can go up to around 45,000 lbs on the highly modified pumps. Thats pressure is why the direct injection system works so well for them. Ever see a psd stage 5 injecter. It has 5 square holes emd machined and flowed. You can barely see the holes in the tips. Any water going thru them and usualy the tips blow off. Then you eat an engine. Friends duramax blew off a tip and it ate that engine. Chevy or GM gave her a new updated engine and another 5 year 100,000 mile warranty. Otherwise she was on the hook for an $11,000.00 engine....