any idea what the difference is between the 155 version of the oil feed (you mean the solenoid valve in the inlet manifold?) and the 156 version?
And Lespix, you're right that the manual states you will need a DTI gauge, but I used the markings in the lower timing belt cover and the poly-V belt pulley for the alternator/PSpump belt. It seems to have worked fine, as the engine is running very well indeed! If you are uncomfortable with this approach, there is a trick to determine TDC with a piece of steel rod, a ruler and sliding calipers.