Hi everyone. I've got a 53plate 1.6 16v sxi twinport. Recently i've noticed that oil is leaking out and on to the manifold heatshield. There is a sensor just below the rocker cover and i think the oil is leaking from there. I took it to my local garage. First they thought it was the rocker cover gasket, had it replaced but it made no difference. Took it back up and they tightened the sensor, but still no joy. Has anyone had this problem before? Is there a seal on the sensor that breaks down over time? All help appreciated.