Why would you want to swap a very efficient canister oil filter with several times the area of the media available for filtering, for a terribly inefficient spin-on filter? The GMC original equipment filter is at least twice as tall, and almost twice as big in diameter than any conventional spin-on filter I'm aware of, with the possible exception of one for a Diesel road tractor. "Old" isn't necessarily "bad" where oil filters are concerned- - - - -the only reason I can imagine for swapping to a spin-on filter from a canister type might be laziness? The best method of filtering oil is to have two filters- - - -one full flow to strain out the big chunks that can damage bearings, and a much tighter media filter set up in a bypass configuration to catch particles down to a few microns in diameter that can pass through a full flow filter like it's not even there. There are several industrial hydraulic fluid filters that are capable of filtering out particles in the 1-2 micron range, while a full flow filter usually has media that traps 15-20 micron stuff.
Jerry
