Talking of changing sparkplugs I once had did a service on a v12 Mercedes coupe with a "full main dealer service history". Got six plugs put of one bank then had to remove loads of stuff to get to the other bank of cylinders. What a pig they were to get out had to leave them soaking in some penetrating oil (WD40) to loosen them up and use a 4 foot pole the undo them just glad none of them snapped in the head. They were all sooted up unlike the other 6.
Full main dealer service my a**. Bet the owner was charged a hefty premium form the Mercedes dealer as well.
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