Lugging stresses the internal components of the engine as it tries to turn the crank that's much harder to turn because of too high gearing for the given speed. Think of it as trying to ride a bicycle at really low speeds in the highest gear. Or to start off in the highest gear.
I try not to pass in 6th or increase speed drastically. Gentle increases should be ok. I make it a habit to downshift for passing.
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