Oil filter housing and system

A method for operation of a dual circuit oil filter, the method comprising

• providing oil to a housing;
• providing a first portion of the oil to a first oil filter under a first pressure;
• providing a second portion of the oil to a second oil filter via a metering orifice, the second portion of the oil under a second pressure;
• returning oil from the first filter to the engine through a first output;
• and
• returning oil from the second filter to the engine through a second output;
• wherein the first pressure is greater than the second pressure.

An oil filter apparatus comprising:

• a housing extending along a longitudinal axis from a top to a bottom, the longitudinal axis oriented vertically, the housing comprising a first oil filter chamber and a second oil filter chamber, the first oil filter chamber located between the bottom of the housing and the second oil filter chamber;
• a lubrication circuit comprising:
• an input configured to receive oil from an oil pump of an engine to the first oil filter chamber;
• a first output configured to deliver oil from the first oil filter chamber of the housing to bearings of an engine;
• a second output configured to deliver oil from the second oil filter chamber housing to a sump of the engine;
• and
• a passage fluidly coupling the first oil filter chamber and the second oil filter chamber;
• wherein the first output, the second output, and the passage extend through the bottom of the housing.