I'm wondering whether the glow plugs are becoming a consumable item on these cars as they get older, I have replaced mine every winter for the last 3 years, last two sets were Beru, NGK before that.

Hot-start fix will lead to them burning out faster but other than that they should be OK.
 
I'm wondering whether the glow plugs are becoming a consumable item on these cars as they get older, I have replaced mine every winter for the last 3 years, last two sets were Beru, NGK before that.
Never had to change glow plugs in 9 years, but then the car doesn't do a lot of short runs with frequent starts.
 

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