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Don't listen to this dealer - HD crap can do same damage (as with any oil). Run what you feel is best & don't sweat the small stuff (like another oil thread).
The new bikes run hot, and no matter what oil you pour into them, they will still run hot. You can lessen the heat somewhat by fattening up the fuel air mixture. Even the big water cooled bikes put off a ton of heat.
One way to get away from the superhot engine, ride an Evo...
I ride a big water cooled bike and it does put off a ton of heat but I don't feel it. I ride in short pants during the hot Tucson summer and the bike heat is negligible. The HD, on the other hand, is nearly unbearable in the same conditions.
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