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Q: Oil Consumption on 1997 Dodge Ram Van 3500

I have a 5.9 engine. Oil and filter have been changed every 4,000 miles. I am using 1qt of oil every 450 miles. No oil leaks,
and the engine runs fine. Getting about 17mpg.
Any suggestions??
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Check these links. Its a blown plenum gasket.
That is a lot of oil to be consuming between oil changes. I would use an engine oil that is one grade up in viscosity than the oil you are presently using, for example if you are using 5/30W use 10/30W or 10/40W.
Oil consumption can be a sign of engine wear. Oil control rings on the pistons, cylinder wear or valve guide/valve guide wear being the most common causes of oil consumption. Excessive oil consumption can be caused by infrequent oil changes, an engine that has been run low in oil, a serious over heating problem in the past that has weakened the tensile strength of the piston rings or random parts failure. To determine the cause you can perform a cylinder leakage and compression test. On doing these test inspect the spark plugs to see if one particular cylinder is fouling due to oil consumption. Examine the tail pipe when you frist start the engine from cold do you have "blueish" colred smoke out the tail pipe? Drive the car on the freeway get a friend to follow you, on acceleration does you tailpipe emit blue colored smoke? Allow the engine to idle for five minutes accelerate the engine does the tail pipe emit blue smoke? The first and third question usually indicate worn valve guides/seals, the middle question is normally worn rings /cylinder bore.
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