Abstract: An apparatus for filtering the oil flow of an engine. The apparatus includes a full-flow filter, whose forward end is adapted to permit use of the full-flow filter either with or without a by-pass filter. The rear end of the full-flow filter is attached to an oil filter bushing, in the same manner as the typical spin-on type oil filter. If the user desires to use the full-flow filter with the by-pass filter, a small hole may be punched in the forward end of the full-flow filter. From this hole, a small portion of oil flows through a connecting hose into the by-pass filter. This small portion of oil is then filtered by the by-pass filter and flows out of the by-pass filter through a second connecting hose to an existing oil system line access, such as the drain pan plug, oil filter cap, or engine valve cover. The by-pass filter is mounted to the engine with a sleeve having grommets. A method of retrofitting an engine for use with the full-flow filter and by-pass filter is also provided.

Abstract: Oil filter apparatus including a first modified high performance full-flow filter and a second super efficient by-pass filter. The modified full-flow filter is adapted to permit the attachment of a by-pass filter hose thereto on the forward end thereof for passage of a portion of oil from the modified full-flow filter to the by-pass filter. A drain plug hose is further connected to the by-pass filter for passage of oil from the by-pass filter to the oil pan. The by-pass filter hose and drain plug hose are connected to the modified full-flow filter, by-pass filter, and the oil pan by means of pivotal swivel fittings adapted to permit attachment of the filter apparatus to any make automobile. The by-pass filter may be mounted inside of a neoprene coated nylon sleeve, by a special mounting bracket, or by a modified by-pass filter base. A method of retrofitting an engine to accommodate the oil filter apparatus is also provided.