thanks for responding.
I would never start any engine with the oxygen turned on. Thanks for the warning though, I remember Alco blew up a lot of crankcases in the fifties when they first experimented with turbo-diesels. My idea was just to use oxygen for a minute or two if I was bogged down to 2nd or 1st gear again on a bad upgrade. 30-40 mph upgrade is not safe, the 30' stock trailer that passed me upgrade on NM17 cut back in my lane abruptly, stopping me- Just to show his engine was bigger than mine, I guess. Blue smoke over 6000' indicates unburned oil, probably fuel in the case of this engine. I was 500 mile out of motor "overhaul" that trip, if you call a re-ring+re-bearing+timing chain at 189000 without new sleeves or bore+pistons an "overhaul". At least the 240D got me out of the city bus, it took me a nearly a year to figure out what was wrong with my V8 Ford . The W123 did have a competent front end rebuild installed. I'll probably take my Ford V8 if I go back to Colorado, although 15 mpg through all the flats is a penalty at $4 a gallon. I got the 240D for $2000. The last turbo I saw for sale in Ind was $5500, 237000 miles, starting problems. It sold quick, too. Turbo hastles include "buckyballs in the oil galleries" communication from a former MDC shop mechanic who had to ream out the oil galleries with a wire. Turbos require Rotella T or the equivalent, I've been doing fine so far with Exxon-Mobil- Chevron-Texaco 20W-50 which squirts a quart out the front seal every 100 miles. Any turbo car I can afford will have a bad turbo, last time I checked turbos were $1300. Turbos are an exhaust component and changing exhaust often leads to broken exhaust bolts or studs in the casting, tow the car to the machine shop. Used turbo models for sale here usually are aluminum head models, one broken radiator hose buys you a new car or a $3300 head +lots of work. Changing hoses is no panacea, diesels are known for shaking off bolts, and a dropped motor mount bolt could pull a hose off. I like Iron Heads, they are more stupid proof.
The 240D gets infinity 0-60 mph now, I've parked it until I find room in my garage to rebuild the motor with sleeves, rings, pistons, pins, chain liners and tensioner, turn crank and install new bearings again. Before I take it out of state the differential also gets all new bearings+ring+pinion gears, it was pretty loose when the engine misfired at high altitudes.