There have been reports of excess oil consumption due to oil burning in the combustion chamber. This can be occurring even without the traditional blue oil smoke noted from the tail pipe. In some cases this oil consumption is due to problems with the PCV system. It is recommend a complete inspection of the PVC system, including this oil baffle inside the valve cover, be performed if excess oil consumption is noted. According to the manufacturer, usage of 1quart of oil every 1,000 miles is acceptable.