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black smoke is over fuel and in a diesel with a turbo that indicates that
1 the turbo variable vanes are not adjusting to low rpm
2- the turbo turbine wheel is not spinning up
3-the intercooler or hoses are leaking boost air
4-- bad injectors -- squirting and not atomizing
You need to determine if it is your oil pan, oil sender switch, oil filter, etc. dripping oil onto your exhaust causing the smoke, or if it is coming out of the exhaust itself. If it is dripping onto the exhaust, deal with sealing the affected area. (new oil pan gasket, sender switch, etc.) If coming out of the exhaust, indicated worn piston rings or valve seals.
If oil is accumulting inside the inetercooler, it means that the turbo-shaft seal is leaking causing oil to by pass in to the intake system, then through to your intercooler. A quick check to see if this is a fault, remove the hose/piping from the turbo the intercooler and place a piece of white paper over the hole at the turbo where the air is dispelled. Run the engine for a few minutes and if you notice any oil occuring/building up on the white papaer, then it is the turbo seal. This method is used on everything from jetskis to dump trucks. If no oil is present then the oil leak will be coming from somewhere else on the engine, and being sucked in through to the top of the intercooler. May have to remove it to see where any other leaks are coming from.
White smoke is usually coolant, oil is usually a blue color, most turbos r cooled by coolant so U may have a coolant leak in the turbo, may B a seal or crack in the turbo. Check your coolant level occasionally to C if it drops.
Diesels do lose a little oil out the blow-by tube. If the engine temp. is higher then normal then you will lose more then normal amounts. If you are not leaking it then you are burning it, Possibly worn rings, head-gasket, or oil leak inside turbo. 68 MPH and higher doesn't sound unusual, is the engine still stock?
Has to be a small oil leak above the exhaust header or pipe...Possibly the rear of the valve cover gasket...because the engine slopes to the rear, oil collects there, and drips off onto the exhaust. (I'm a 30 year retired British Leyland auto tech)
possibly oil leak from rockercover onto exhaust,burning smell and even a little smoke,i had a 98 and the same issue,theyre very good so its not going to be too serious,rocker cover gaskets are normal to do