Most well used diesels get a liberal coating of oil over just about every internal and external component, fortunately the heat of combustion tends to keep the important parts free of most of the oil - and the heat of a working glow plug of course burns off the oil that would otherwise coat it.
Could be the glow plug isn't working...
Testimonial: "after thinking about it decided to test glow plug.NO GOOD.thanks you are correct"
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