The dealer I preferred to service my Fiat from used to race a Porche - he used to just drop out the whole engine/transaxle unit to change the spark plugs - took him far less time than trying to do it while still in the car - but he did have a whole bloody workshop and paid mechanics on call....

Saw this thread, and had visions of "Planned maintenance screw ups" as "Maintenance Screw Ups that were planned"...

As in "Failing to plan means planning to fail" ....