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Gary, GMC Technician
Category: GM
Satisfied Customers: 16873
Experience:  15 years gm master tech/15 years ASE master tech
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Have a 07 denali 6.2, smokes on start up ,and on my 2nd

Customer Question

dave ' have a 07 denali 6.2, smokes on start up ,and on my 2nd quart of oil in 1500 miles,any thoughts
Submitted: 1 year ago.
Category: GM
Expert:  Gary replied 1 year ago.

I am sorry your having this problem

is this something you plan on fixing yourself ?

or looking for a good idea before it goes into the shop ?

Customer: replied 1 year ago.
im looking for answers and maybe what to tell my car guy about fixing it
Expert:  Gary replied 1 year ago.


there is a service bulletin for this issue # *****: Engine Oil Consumption on Aluminum Block/Iron Block Engines with Active Fuel Management (AFM) (Install AFM Oil Deflector and Clean Carbon from Cylinder and/or Install Updated Valve Cover) - (Nov 26, 2014)

your car guy should have access to that bulletin number

the PCV valve cover needs to be changed and the oil pan needs to come off to remove the AFM valve and a new shield installed

all laid out in the bulletin on what to do and part numbers

if after the bulletin is done and it STILL uses this much oil then the piston rings would need to be changed