Oil pan removal on a 2011 MZ 3 2.5 liter. I have downloaded an e manual and the instructions speak of removing coils and spark plugs, why? I am only removing an oil pan to re-thread the drain bolt that someone previously over tightened. (I do not want shavings to remain in pan) I have worked on many older cars that basically you only have bolts holding the pan on. What all actually must be removed and what if anything in these instructions is not necessary?