It really sounds like is possibly going to lead to the lifters in the engine being replaced. The vehicle has about the correct mileage for the concern. To detect the oil consumption usage is pretty hard to find and i would seriously take a look at this over active lifter concern.
#PIP4492X: Oil Consumption And/Or Exhaust Smoke Due To Oil In The PCV System - (May 25, 2011)
|Subject:||Oil Consumption and/or Exhaust Smoke due to Oil in the PCV System|
|Models:||2009 Buick Lacrosse Super, Allure Super (Canada Only) |
|2003-2011 Cadillac Escalade |
|2010-2011 Chevrolet Camaro |
|2003-2007 Chevrolet Corvette |
|2009-2011 Chevrolet Colorado |
|2003-2011 Chevrolet Avalanche, Express, Silverado, Suburban, Tahoe |
|2006-2009 Chevrolet Impala |
|2006-2007 Chevrolet Monte Carlo |
|2003-2009 Chevrolet Trailblazer |
|2003-2011 GMC Savana, Sierra, Yukon |
|2005-2008 Pontiac Grand Prix |
|With any of the following V8 Engine RPO Codes:|
|5.3L - L33, L59, LC9*, LH6*, LH8, LH9, LM7, LMF, LMG, LS4**, LY5|
|6.0L - L76*, L77, L96, LFA*, LQ4, LQ9, LS2, LY6, LZ1|
|6.2L - L92*, L94, L99, L9H|
This PI was superseded to update Recommendation field. Please discard PIP4492W.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
On rare occasions, some customers may complain of excessive oil consumption and/or blue exhaust smoke.
Upon inspection, obvious oil will be found in the intake manifold and/or PCV vacuum tube if this PI applies.
This may be the result of:
A PCV fresh air hose that is pinched or restricted by plastic casting flash (this would normally be a concern since new, or shortly after engine repairs).
Plugged PCV baffle drain holes in the valve cover that has the PCV vacuum pipe attached to it (this would normally be a concern at high mileage).
An improperly sealed PCV valve cover baffle (this would normally be a concern since new, or shortly after valve cover replacement).
Over-aggressive valve lifters (can occur intermittently and generally starts to occur at low mileage - less than 10,000 miles or so).
If the latest version of bulletin 01-06-01-011 identifies excessive oil consumption but SI diagnosis does not isolate the cause of it, inspect the PCV vacuum pipe to see if obvious oil drips out of it and/or look through the throttle body opening to see if there is obvious standing oil in the bottom of the intake manifold (as much as a ¼ quart in many cases -a teaspoon or two is typically just normal oil residue). If there is obvious oil in the PCV vacuum pipe and/or in the bottom of the intake, perform the steps below as necessary and re-evaluate the oil consumption concern:
Step 1. Inspect the fresh air hose/pipe and all related connections to make sure that no restrictions exist (plastic casting flash, pinched hose, etc.), which may cause excessive crankcase vacuum. Repair the restriction as necessary. Generally, the oil consumption would have been a concern since new, or shortly after engine repairs, if this is the root cause.
Step 2. On 2009-2011 vehicles built before January 2011, replace the valve cover that has the PCV vacuum pipe/hose attached to it using part number 12642655 and re-evaluate the concern. This valve cover contains an updated baffle to prevent oil ingestion through the PCV system that can occur if there is an over-aggressive lifter(s) that pumps too much oil through the push rod. Vehicles that have this valve cover installed should not experience oil consumption even if there is an over-aggressive lifter(s). As a result, the following steps 3-5 do not apply to 2009-2011 vehicles that have had this updated valve cover installed during service or production.
If excessive exhaust smoke is also noted, also drain/clean the oil out of the intake manifold and install the intake with new intake gaskets before releasing the vehicle to the customer. If this is not performed, the customer may return with an exhaust smoke complaint due to the residual oil in the intake manifold even though their oil consumption complaint has been repaired.
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