Dear Group My astra diesel 1.7TDS 1997 (Isuzu engine) has done 167,000 miles and requires a cambelt replacement as per servicing specification at each 80.000 miles. I do not know much about the cambelt but have been advised by the garage to also have the cambelt rollers replaced, but its up to me. What would others who know more about this type car/engine advise Thank you in advance. Iain