depends on what type of driving you do... I did a 7k roadtrip in an '84 300d, I removed the mechanical fan and installed a pusher electric fan, Since I was on the highway 98% of the time I only used the electric fan a handful of times.

I would not recommend it for a vehicle that spends a lot of time in heavy traffic, idling, A/C, etc.

The mechanical fan loads the crank all the time, even with a properly operating fan clutch, an electric fan only loads the engine when it is actually running.

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Cheers,
Robert