At around 90K miles the front rocker cover gasket had a noticeable leak on the left side near the cam pully’s. Having removed the plenums anyway to pull the injectors for a ultrasonic clean, it was a simple task to unbolt the rocker cover and renew the gasket (also need to remove the coil pack).
Front Rocker Oil Leak 
Vectra V6 Plenums Cleaned 
Rocker Covers Cleaned / Painted 
The rear rocker cover was inspected and did not need a replacement gasket. The rocker covers were then cleaned and painted, along with some further detailing of the upper engine compartment.
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