Higher than Expected Engine Oil Consumption (Replace Rocker Arm Cover)
| Subject: | Higher than Expected Engine Oil Consumption (Replace Rocker Arm Cover) |
| Models: | 1998-2001 Chevrolet Cavalier |
| 1998-2001 Pontiac Sunfire |
| 1998-2001 Chevrolet and GMC S Truck Models |
| with 4 Cylinder 2.2L Engine (VINs 4, 5 - RPOs LN2, L43) |
This bulletin is being revised to correct the warranty information. Please discard Corporate Bulletin Number 01-06-01-030 (Section 06 - Engine).
Condition
Some owners may comment on higher than expected engine oil consumption, therefore, having to add oil between oil changes.
Important: For the LN2 and L43 engines, oil consumption greater than 1 quart (0.9 L) within 2000 miles (3200 km) is considered excessive. The oil consumption rate should be verified prior to repairs, as per Corporate Bulletin Number 01-06-01-011 dated March, 2001.
Cause
Two potential causes of high oil consumption have been identified:
| • | The RTV seal between the stamped aluminum PCV baffle plate and the underside of the engine rocker cover may have deteriorated, allowing excessive oil mist to intrude into the PCV system. |
| • | The molded silicone intake manifold side gasket may have deteriorated at the PCV flow orifice, allowing excessive PCV gases to flow into the intake manifold. |
Correction
Follow the guidelines listed under Oil Consumption Diagnosis in the Engine Mechanical section of the appropriate Service Manual, or in SI2000. If there are no other evident reasons for the concern (such as leaks), replace the rocker cover assembly with the new design cover, P/N 12570563, and replace the intake manifold side gasket with a new material gasket, P/N 12564499.
Parts Information
Part Number | Description | Qty |
|---|---|---|
12570563 | Cover, Vlv Rkr Arm (inc. Gasket) | 1 |
12564499 | Gasket, Int Manifold | 1 |
Parts are currently available from GMSPO.
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation | Description | Labor Time |
|---|---|---|
J0308 | Cover and/or Gasket, Rocker - Replace | Use Published Labor Time |
J0251 | Manifold or Gasket, Intake - Replace | Use Published Labor Time |
