Holden Astra 2007: Are there common problems with the CDTi?

My 2007 Holden Astra CDTI was flawless until it reached 90,000km. Firstly the EGR valve failed, now the swirl flap guide rod has broken off, which requires a whole new inlet manifold. As they have dismantled the car they have found that the water pump is leaking and the high-pressure injector pump is leaking as well, and with a new manifold the car also requires a new swirl flap actuator. The prices of some of these items are staggering and now the extended warranty company is beginning to become difficult. I have approached Holden Customer Care seeking some assistance, but I'm not sure where that will lead. Holden is saying that it's outside of the warranty period, but my argument is it's only done 90,000km and has not missed a service at a Holden dealer. I cannot believe the misfortune that I'm having and have serious doubts of whether I would ever buy a diesel vehicle car again. Am I the only one with these problems?