Quote:
Originally Posted by knightwrider
Hello all,
I apologize if I'm not in the correct thread location.
I have recently bought my first 240D. It's also my first diesel car. And my first Mercedes... So basically, I'm a complete noob on this topic.
My question is, is ok to drive 60-65 on the highway? I just feeling like I'm revving the engine to the moon at such speeds. The car is an 83' with the 4spd manual. I'm assuming it has the higher ratio rear end, and that at 60 mph the engines turning at about 3000 rip 'ems. Could I swap the differential for say the 2.88 from another car? Would that even be beneficial? Where would I get said diff? I live in a flat area so hills aren't a concern. And hey, I bought a car with 64 horsepower, I'm not a speed demon either.
Thanks for the help.
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I have been advised by MB that the 616.912 engine + MT should not be driven for sustained periods over 4500 rpm.
I have driven at 3500-4000 at 70-72 mph for extended periods with no ill effects.
This car has 132,000 miles and is kept in top shape valve- and injector-wise.
What it all really depends on is the cruising rpm for the vehicle engine. That's the one for which high-speed cruising (Autobahn) is designed.
FWIW