I can definitely vouch that cheap glow plugs are crap and make a hard start. I changed for Bosch and almost immediate fire up on first turn of the key.
 
Beru, Delphi and NGK are also good.:D

Last lot of Delphi I had weren't so good. Beru were much better and so far have maintained their performance. Get what you pay for sometimes. Not tried Bosch.
 

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