quote:
Originally posted by Ray H:
Short answer? Reserve oil capacity and somewhat increased cooling effect. If a larger filter has the correct diameter and thread pitch outlet, a compatible sealing gasket diameter, the same bypass pressure range, more filtration medium (a big "if" that cannot be assumed), allows refilling with an increased quantity of oil, costs the same, and there's sufficient physical clearance to be feasible, why not? Unless the filtration medium of the larger filter filters smaller particles than that of the standard size filter, there will be NO increase in oil cleanliness. But, the larger filter will have more reserve capacity before it's saturated. If the larger filter does have increased medium area, more oil volume can be "pushed" through the filter at a given pump pressure - less reliance on the bypass valve to maintain oil volume and pressure with unfiltered oil to the engine in marginal or high output situations.