The parts are more expensive. I think last time it was $56 a piece for the glowplugs. The real expense comes from the labor to remove everything else to get to the glowplugs and also the fact that they stick and break off in the head. I think five broke off this time. I'm relatively mechanically inclined but I wouldn't even consider trying and drilling these out of an aluminum head. I know my limitations and this far exceeds it. The head actually came off and was heated to help loosen the damaged plugs. I think the main cause is a badly designed glow plug that allows carbon to build up an cement them in place. And, I'm not a sedate driver. Carbon buildup elswhere in the head was not a problem. BTW, to be fair, this price included a replacement timing chain. It wasn't needed and wasn't that expensive but the head was already off and was worth doing now.