Is a Euro 1985 300TD wagon turbocharged?

Next is 300k miles is a lot of miles no matter how good it looks.

More then a few rubber (Motor Mounts, Trans Mount, Flex Discs, Oil Cooler Hoses, all of the suspension arm joints) parts on the car would be on their last legs if they have not previously been replaced.

All those items should be inspected as best you can. The Flex Discs and Oil Cooler Hoses should top the list.

$6,000 seems too much for that hi of amilage. $4-$5k might even be too high.

The My Type Fuel Injection Pump has O-rings on the Delivery Valve Holders that occasionally need to be changed. It is not a bad job but at least 3 Members have gotten into trouble doing it. So it is a job you need to be extremely careful with.
The good news is there is more room on you Engine and you don't have to remove much to change the Delivery Valve O-rings as you do on the 6 Cylnder Engines on the lager models.

In shot it is a good looking Old Car but still and Old Car.

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84 300D, 82 Volvo 244Gl Diesel