Remove the oil filler cap and look inside of the valve cover to see if there is a pool of oil "standing" there.
If so, you'll have to syphon the oil out, remove the valve cover and clean out the oil "drain back" holes along the edges or corners of the cylinder head.
If not, double check closely for oil leaks, especially around the oil sending unit (aka oil pressure sending unit) often located near the oil filter. If this is the case it would only leak when the engine is running, especially at high rpm (like when driving). This could explain why you don't see a leak.
December, 21, 2012 AT 2:22 PM
Also check your pcv system fornot working or blocked, then do a compression test wet and dry to see if there is a problem in oneof the cyl
December, 24, 2012 AT 3:31 AM
The engine doesn't smoke, according to the poster. So the pcv or a worn cylinder probably is not the cause of this excessive oil consumption.