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I had a 740 turbo. Parts are more money than a Benz (at least at the time I had the car). Some of the aftermarket parts for the Volvo were complete crap and therefore you had to buy factory parts $$$. Strut mount bearings.
The 240 is a very basic Volvo, those 4 cylinder gas engines last quite a long time if you take care of them. They have some specific issues that need to be checked (cam shaft seals, wiring harness, couple of water pumps etc.)