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he made the statement about the stability of the engine at rpm. think about inertia, things in motion like to stay in motion...so does your engine, driveshaft, axles, etc. they rather rotate at the same rpm than fluctuate. they do not like rapid changes in rpm as it requires large changes in angular/rotational momentum. in the city, the car requires the fan for heat transfer, whereas with highway driving you have incoming air for heat transfer which is much more efficient. then you have the fuel inefficiency of city driving on top of that. inefficiencies due to shifting, changes in throttle points, etc.
all of these inefficiencies put strain on the oils/fluids, as they are doing all the stabilizing, heat transfer, lubricating, etc.
think of it this way: city driving=large changes in everything; highway driving=smooth operation and constant motion
all of this assumes that you are driving at an efficient rpm on the highway as well. its all about the rpm...
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