Hello,

I have the exact same problem and issue with the dealers. The valve cover is made of magnesium and it would be very easy to over torque the bolts. My other concern is removing the old gasket from the head and/or cover. My car is also a 2006. I am very tempted to do the work myself. Has anyone actual performed this work? The cost of the gasket is $17.88.

Not alot of information in the service manual....

CYLINDER HEAD COVER

DESCRIPTION

Magnesium cylinder head covers provide trouble-free sealing, are lighter than aluminum and dampen valve noise.
They are cast in two pieces to create internal ventilation passages with oil separators for crankcase vapor ventilation.
This ventilation system virtually prevents the possibility of oil sludge formation due to the retention of water
vapor in the engine.

REMOVAL

1. Remove the air cleaner housing.

2. Disconnect the ignition coil harness connectors (2).
3. Disconnect the spark plug wires (1) at the spark plugs.
4. Position aside the vacuum hoses at the cylinder head cover
retainers (3).
5. Disconnect the crankcase ventilation hose from the left cylinder
head cover.

6. Remove the cylinder head cover bolts (1) and the cylinder
head covers (2).

INSTALLATION

1. Check the gasket for tearing and breakage. If damage is
evident, replace the gasket.
2. Position the cylinder head covers (2) on the cylinder head.
Install the cylinder head cover bolts (1) and tighten to 10
N·m (7 ft. lbs.).