My experience from 8 years and almost 40,000 miles with Tarka, the Plus 8...
1. Sump... the guard is a VERY good idea. The oil filter housing is plastic and secured by a captive brass nut moulded into the plastic. It is the lowest part of the car: if the nut is ground away the filter housing falls of and the oil is pumped out very quickly. The Wolf plate protects this part.
2. OBD....my car had a regular habit of triggering the Engine light. Always the same, the left hand catalyst O2 sensor wasn't sending data fast enough to the computer, so the computer assumed the cat wasn't working. Every time this was triggered accelerating hard when the ambient temperature was low and I'd been cruising at low revs. Better to change down before pushing the loud pedal for. I ended up keeping the car in sport mode as this seemed to minimise the risk of the light coming on.
That is about it...occasional gremlins from the CanBus network to do with rear lights, brake lights, etc.
Always used premium unleaded and Mobil 1 oil.
Never broke down, never had a puncture.
