Numptie of the highest order
Re: Slow warm up / running too cold ?
I've been staying off boost and warming my car up / cooling it down very carefully since I had engine troubles last year.
I can probably go about 5 miles before the water has got to 90c then I leave it a bit longer before even thinking about accelerating hard, I would also say this is perfectly normal.
WIth regards to the temp dropping - my car never moves of 90 once it's there even on slow motorway driving below zero or after thrashing the nuts off it for 10 mins.