Cetane not Octane booster.

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1983 W123 300TD US spec Turbo engine, with Euro bumpers and manual climate control, and manual transmission.

Yeah, and at 4,200 feet he's way below that 2,000 meter level. I can't imagine 4,200 feet being a problem at all. What color is the smoke?

The best test I can really think of is, drive it 600-800 miles, and check the oil consumption. If it's like the NA I had in brown car, it was smoking, I thought it was just un burnt diesel because that's what it smelled like...turns out it was burning oil....around a quart per 500-600 miles.

If that's the case, well, injectors aren't likely going to help, if it sat for a while, I've read here many guys soak the rings with mystery oil...but I have no experience with that.

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1983 W123 300TD US spec Turbo engine, with Euro bumpers and manual climate control, and manual transmission.

He's not burning any oil, use to and then one day....i went to check the oil and nothing was lost...I was shocked!

The smoke is white, when smelt it smells just like diesel.

I will go get a bottle of cetane booster and see if that does anything.

I will have to take it for a trip and see if that clears up the smoke, so far I have only driven him 100miles around town...

I also need to drop the tank, and change the filters...

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Sounds like worn out injector nozzles to me....Once I replaced them on my 190d it runs so clean at idle there's nothing visible at all.

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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

Well it appears to be self healing as it were. I don't have the smoke like a did, well frankly I don't see much at all. I did that purge, and then dumbed what was left in the tank, got 15$ more of fuel and stuck some cetane booster in it...Guess it may just as well been from sitting and old fuel....

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Well the smoke has seemed to have came back. So I am going switch the bosch injectors from my 78 into this guy, they were just installed a few years ago....no smoke out of that car.....so we will soon find out if the injectors are at fault....they will be shipped to greazzer to be checked out when I get the funds....had to order a slide hammer as one heat shield is stuck in....couldn't get it out way back when...

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My International Harvester back hoe ( German Neuss engine ) has some white with a tinge of blue smoke when cold. Put a load on it when hot and the smoke will go away. At some point it will get new injector tips as I attribute the smoke to poor spray pattern.