Haven't been able to view the video yet but I have another question for you experienced guys. Running spark plugs past their due date. What are the serious issues with running plugs that are to be changed at 64,000km to say around 69,000km.

Also in my 1.4 tsi Jetta if I go full throttle in gear 3 and 4 after the engine has warmed up I feel the car misfiring then the EPC light comes on and the car disables that cylinder that was misfiring. Switch off the engine and restart and the EPC light clears and the car is back to 4 cylinders. Wasn't able to change the plugs till 69,000 so was wondering what potential damage may be done even though the car seems fine now.