spark plugs- taking out at hot or cold?

alfaromeo2.0

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im sorry, im not shure of the name in english
im talking about
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i saw at a french forum about repair man breaking 2 "candles" in a 98 E300TD
they talk about not having heating the engine before taking the off

are there candles to take off at cold engine and others with hot engine?
diesel and gasoline (benzine) are the same system?
 
We are talking spark plugs then! I've not had trouble removing them from a hot engine but I suppose it is more sensible to remove and fit them when the engine is cold as metal expands when it heats up and you will get a tighter fit that way.
 
Also - Diesel and Petrol plugs are very diffent - the glow plugs in a diesel cannot be compared with the spark plugs in a petrol engine.
 

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