If you want to get the max life out of your Glow Plugs use a Glow Plug Reamer or one of the alternative methods spoken of in some of the Threads/Posts on the subject.

If you must use Starting Fluid disconnect the connector that goes to the Glow Plugs at the Glow Plug Relay. That way they will not be on when you give it the Fluid.
Also have someone else crank the Engine so that you can stand there and spray the minimum needed to get the Engine going.

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84 300D, 82 Volvo 244Gl Diesel