I second checking the Glow plugs. You can easily do a check of the Glow Pugs before you buy the Car. Go tot he Diesel Giant web site he has how to do pics.

You need to be more specific concerning the Squirting Oil Leak. Depending on where it is squirting from it may or may not be somethin serious.
By serious I mean as example; a squirting Oil Cooler Hose could easily become a bigger leak while drivning and ruin your Engine.

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84 300D, 82 Volvo 244Gl Diesel