oooo Why th change, just the mileage? 2 main things are the EGR valve and swirl flaps on the inlet manifold. Before you buy, physically check them or check the service book to see if they've been replaced. If they look and actuate okay, you should be fine.
Another is the gearbox in the 1.9 Astras, they use the M32 which is renowned for eating itself and the thrust release bearing failing.
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