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Originally Posted by boneheaddoctor
better on open highway running. SPecifically where you will have higher top speeds. Will keep the engine closer to its optimum operating range in that case....but around town acceleration will suffer. Is it best for you? That depends on where most of your driving is done.
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actually, 300d is my everyday driver to work about a total of 50 miles both ways, workbound and homebound. im doing a combination of both open highway, and stop and go traffic most of the time where the engine runs a little noisy and rough and the water temp is high, but when i get a chance, i drive it 100+ mph which also makes the water temp rise to 100 deg.+. but the engine is quieter and smoother at 3500-4000 rpms. water temp is normal, 80-90 deg at 65-75 mph @ 3000 rpm.