Did you know he has taken the fans off all of his old MB diesels and drives them that way?
Well, I know that....considering I was the one who bought his last W210 diesel, and it didn't have the fan. But the car didn't overheat -- indeed, it never even went above 80c the 300 miles return trip I made, or overheated the entire time I had it. I believe his claims that he went to Las Vegas with no fan.
Unorthodox practices or not, it works for him. Who is to judge?
But yes, your advice should apply to all cars, not just MB.
Friend of mine bought a 04 Chevy Trailblazer. The previous owner had two thick binders full of service records from new up all the way to 144k. Two weeks after my friend bought the car, the transmission pump gave out and the car stalled. He had to rebuild it to the tune of $2000+.
The records indicated that the transmission was last serviced at 120k, and the fluid was still red. So much for a supposed "bulletproof" american car.
On other hand, an casual acquaintance of mine (and customer) went out and bought a 2001 MB S600, with NO service records whatsoever, against my advice. Eight months later, the car is still ticking along with nary a misfire or any other oddities that M137 veterans are familiar with. All he did was to continue the MB recommended routine service with me.
Now I am not advocating that we all should buy cars unseen or exclusively focus on those maintained by an zealous mechanic and driven by a grandma, but honestly... shit happens.