Got a 1.7 l DTI (Diesel) engine in my Astra estate. Been a great car, still\nworking fine, but have been told there's a "bit of oil in the coolant", and\nthat the gasket will need replacing. The dealership has costed this at\naround £1000, saying that it involves a very major job, and replacement of\npumps etc........ as well as the gasket. Is this a bit over the top? Should\nI get a "little man down the road" to do it........or do I just part\nexchange for a new one at a different garage before it totally goes? I am\nnot detecting any difference in performance, or smokey exhaust.