good morning I was looking for some help please. i have a 2011 Corsa. past few months it has started smoking from the exhaust. this does not happen every time it is used. i have been told it may be the turbo (was then told the smoke would be blue - it is grey) then i have been told possible egr valve or have been even told to replace the full engine. i have been off work ill for 10 months and only returned this week and hoping it isn't going to cost an absolute fortune - or is it worth doing at all? any advice would be appreciated. thanks

It does sound like infrequent use of the car has led to the build up of carbon which disappear with more use and harder acceleration once the engine is hot
Hold it for longer revs through the gears(slip roads are good for this as you can see the soot being emitted from the exhaust when the power is on)