If the oil filter cartridge is on the top of the engine, the service information may direct you to pour a specified amount of oil into the filter cavity before the __ 15 installed Select one: a. O-ring b. End cap c. Housing d. None of the above

The correct answer is b. End cap.<br /><br />When the oil filter cartridge is on the top of the engine, the service information may direct you to pour a specified amount of oil into the filter cavity before installing the end cap end cap is the part that seals the oil filter and allows oil to flow into the filter when it is installed. By pouring oil into the filter cavity before installing the end cap, you ensure that the oil filter is properly lubricated and sealed, which helps to prevent oil leaks and ensures proper engine lubrication.