2 qt you can go longer between oil and filter changes.
Best thing going is the PurePower Filter System.
www.gopurepower.com
I am WD.
More flow, better filteration, machined check ball and spring bypass will not open unless filter element is clogged but will open if filter gets stopped up with debris. Every piece is machined for raw billet and is easily checked for inspection. Has vertical magnets in filter element to trap ferious materials. Re-usable infinetly. 1,000 pis burst strength.
Costs lots more money than throwaway paper filters.
Ed