Clio 1.5dci black smokes badly when reved up - 2003 Renault 181

blue is oil can be from head gasket to piston damage --black smoke is need a tune up

black smoke is not enough air for the mixture
the intercooler hose swelling up when the turbo cuts in indicates a blockage in the intercooler or air inlet into the manifold
with a blockage ou will get black smoke so check the intercooler cores for blockages

Black smoke means rich mix (gas, not diesel right?). Bad coolant temp sensor?

if its black smoke then its a fuel problem too much fuel the car can`t burn it . could be fuel injector over fueling. if its white smoke then its burning coolant, there is a head gasket problem that is damaged in the cyl #3 area. it could also be a bad valve guide/valve seal, oil rings, compression rings. you don`t say what colour the smoke is.

this car must be a Diesel as this sounds of a injector pump failure , there are two fine machined plates with groves cut in them "inside pump" after a lot of miles these two machined plates are not so machined anymore and fuel slips by causing the symptoms your describing , pump will need to be rebuilt and flow bench set or replaced with allready rebuilt/set unit to get things back to normal

Does the Kabota have glow plugs? Or just compression start?
If glow plugs, let plugs warm a little longer before starting.

Diesel?? Black some is unburned fuel, due to poor combustion. Get a compression test, but you may also have a leaky injector.
Gas engine?? Due to too much fuel, too rich. Make sure air filter is clean, Clean up your intake and IAC system. Scan it if it continues.

if its a 1.6 16v and it sounds like a bag of spanners its a camshaft dephaser that is faulty

it may be the oil rings and not the compresion rings? or may just be the valve stem oil seals.

im afraid to say that yor piston rings are worn and will need a engine rebuild , you could try and put a thicker oil in 15w40 or 20w40 if you can source it . hope this helps