1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
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17,276 Posts
Aftermarket PCV vacuum draw calibrations can vary. This can affect oil consumption and/or idle quality. Always use an OEM PCV valve.
Oil quality can vary widely as well. Even though it may be a 10W-30, a poor grade of oil can affect consumption and/or engine noise vastly. Just an oil change to a premium recommended brand/grade (meeting or exceeding MS-6395) of motor oil can fix this. Observe the oil odor and pour-speed to compare old and new oils. You may see a big difference. I've seen this with my own vehicles.
A good test of the intake manifold plenum sealing while the engine is idling is to remove the PCV from its grommet and block the breather tube and hold your fingers over the grommet hole and count to 10. Then unblock the hole and note if a pressure or vacuum was developed inside the engine during that time. If the hole draws air after removing your fingers, you have a plenum leak. If air pushes out, you are OK.
Oil quality can vary widely as well. Even though it may be a 10W-30, a poor grade of oil can affect consumption and/or engine noise vastly. Just an oil change to a premium recommended brand/grade (meeting or exceeding MS-6395) of motor oil can fix this. Observe the oil odor and pour-speed to compare old and new oils. You may see a big difference. I've seen this with my own vehicles.
A good test of the intake manifold plenum sealing while the engine is idling is to remove the PCV from its grommet and block the breather tube and hold your fingers over the grommet hole and count to 10. Then unblock the hole and note if a pressure or vacuum was developed inside the engine during that time. If the hole draws air after removing your fingers, you have a plenum leak. If air pushes out, you are OK.