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skipcfd

2007 Chevrolet Silverado 1500 Burning oil

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My truck has been burning oil for awhile now, and there has be no signs of leaks under the truck. I have changed the valve cover/PCV valve, and the passenger side valve cover gasket with no improvement. This morning, a friend called that was behind me and said when I was accelerating they saw bluish smoke coming from the exhaust. Ideas? 

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37 minutes ago, PTXer said:

Run a compression check?

Not as of yet.

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Your piston rings might be worn or your cylinder could be scored. What kind of oil you running in the engine?


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Here is what I would do: 

 

Replace the oil and filter with the recommended type.

 

Check the engine codes

 

Run a compression test or possibly a leak down test. 

 

Inspect the spark plugs. 

 

Possible causes of oil burning: 

 

 

Over full oil

Incorrect oil type 

Bad oil scraper (wiper) rings

Cylinder wall damaged 

Bad valve guide seals 

PCV valve issue (known 5.3L engine issue >>> see TSB's)

Bad intake manifold gasket 

Bad head gasket 

Cracked cylinder head 

Warped cylinder head 

 

If I had to take a wild guess, I would say that the oil level or oil service was neglected at some point, and the engine is warn out because if it - but that is just a wild guess. 

 

 

 

Possible cheap easy fixes: 

 

Replace the oil

Fill oil to the proper level 

Use ATP-205 re-seal ( for the valve guide seals) 

Replace the PCV valve with the updated part number 

 

Edited by starman8tdc

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It’s a 2007, my guess is that it’s old and wore out. Unless I missed it I saw nothing about how many miles it has on it.


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If you are still burning oil it from the truck going into v4 when that happen it shuts 4 cylinders of and the oil builds up on them ver time and it starts burn your oil so What i foind that help fix the problem is that you change your oil put 6-7 ounces of sea foam in with the oil run it for 3000 mile or till the oil is black then change the oil again then repeat the proccess 2 times


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