I have a Mitsubishi challenger 2.8 turbo diesel Which just started smoking and when I leave sometimes the level counter is not picking up causing excessive smoke from the exhaust pipe.I don`t know what could be the problem help please.

SOURCE: thick white smoke coming from exhaust

I would think this will be a blown turbo.

These are fed by a small oil pipe and if the unit overheats (due to wear) - this oil fill feed directly into either the inlet manifold - or the outlet - exhaust.
If it is spilling oil into the hot exhaust - you will get a thick white fog. You can confirm this by placing a clear glass bottle or jar in the exhaust stream - and see if it gets a thick coating of oil on it. If it evaporates - it's water, if not - or feels oily - new turbo or overhaul.

Best get is sortd sooner rather than later - as you may be able to save most of it for an overhaul rather than scrap it if badly worn.

SOURCE: large amount of white smoke on first start of the day

Have you had the injector recall check carried out? There is a problem with these injectors and this produces the symptoms you are describing. I suggest that you contact Isuzu direct for help. They have been very helpful in the case of my trooper

SOURCE: White smoke from Exhaust

hardly likely the exhaust job would cause that, but yes it sounds like you got a blown head gasket. badl lock stricks hmm! also preasure test cylinder head for leaks

SOURCE: blue smoke from exhaust

Blue smoke is a sign that oil is being burnt in the combustion process. It is normally a sign of high engine mileage. Definately a compression test would be in order to try to pinpoint the cause. In addition to high mileage it could be something like a broken piston ring or a valve not seating properly. It might also be possible that you turbo has a bad seal and is putting oil into the air as it spins. This problem should definately be looked into soon. Hope this helps.

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SOURCE: smoke is coming from the dipstick, 6.5L turbo diesel

Sounds like you have a clogged PCV valve thats the valve that lets the gases that get into the crankcase be rerouted back into the intake. It's silver about two inches and is usually in a rubber fitting in the valve cover and will have a hose on the other end. it's no tools installation just pull the hose off pull it out and replace with a new one. thats the first thing i'd do - 10 mins and 10 bucks should do it