lots of the new diesels run pretty big boost as std,
yes 20% is acheivable, it comes down to driving style, and learning to drive to use the remaps benifits, you can stay in higher gears for much longer as you have plenty of torque to pull out of it, and just use less throttle pretty much all the time.
its not often we increase boost pressure at all on our normal remaps on the diesels.
my old corsa van had a std remap on it and i saw 60 miles more per tank, my bmw is even more than that but we have done a fair bit of work with it now.
Strain isnt really ever an issue as far as ive known, they all seem more than capable of running some extra ponies. mines around 25% up on power and ive had no dramas at all.
personally all i ever do is just change the oil before due date, to keep it clean, saying that my bmw does 16000 miles between oil changes, so i just cut it to 9k, thats just me personally, i dont know there is a real need for that, but i dont like the idea of doing 16k on oil
