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NCFatBoy said:
I was told by my dealer that synthetics cause the pin bearing(?) to get worn flat.
LOL

As far as I can tell, the reason not to use synthetics at break-in is because it is just a waste of money. You are only going to run it 500-1000 miles, why spend all of the money? I have heard the "synthetic is to thin for break-in", and I do not believe it. A 50 weight oil, is a 50 weight oil, no matter what it is made of.

If you want to spend the few extra bucks for synthetic, go for it. It will not effect your warranty. It is mostly just piece of mind. I know a lot of people who have got high mileage engines that only used discount oil and filters.

HD suggests changing it at 1000 miles. So, at 1000 miles, change it. If you feel like changing it at 500, fine, change it again at 1000.

I myself use Mobil 1 synthetic, every 5000 miles. 15w-50 in the tank, 75w-90 in the primary.
 
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