Quoted from http://www.converseengineering.com/explanation.htm
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Despite the "dependable" image of the Volvo, some models do have problems. The diesel 6-cyllinder is known for surviving for 200-300K in mileage, yet if maintenance isn't performed regularly, a broken timing belt or a serious overheating session can sideline the vehicle with a very expensive engine repair. Parts for rebuilding all Volvo engines are expensive, and the diesel particularly so. The turbocharging system of turbo models is expensive to overhaul, and the V6 models had a common problem of inadequate lubrication to the camshafts.
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