I'm not close to those kind of miles, but my 450SEL has 266,000 on the original engine and transmission. No major work has been done to it to the best of my knowledge. I've had it since it had 65,000 miles. It still runs great and shifts wonderfully. I've done only minor maintenance to this auto. I've always liked the W116. This was a European gray market car that I've had great luck with. It gets 16 mpg on the worst days and 19 mpg on the highway. Also has more horsepower than the American version, and I like the bumpers on the European W116 better. It also handles quite well for a car its size.

That said, I am a better driver with my W123. And it gets around 27 mpg on fuel that was still $1.69 per gallon this morning. Gas, 83 octane at that, is $193.

__________________
Mike

2000 SL500 22,000 miles
1981 300CD 188,000 miles
1979 450 SEL 266,000 miles
2005 Cadillac CTS 25,000 miles