Note: New Bosch Glow Plugs do not come with the little 8mm Hex Nuts and they are easy to drop.

Bosch or Beru Glow Plugs are the only ones Forum Members recommend. The Bosch ones are inexpensive and entirely adequate and easy to find.
The Beru Plugs are have better longevity but are more expensive and harder to find.

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84 300D, 82 Volvo 244Gl Diesel