Some of you seen the thread in DC on my eBay purchase. Well its here now, started up after charging the battery and I rode it home. Now looking through the manual it calls for HD (Harley Davidson) motor oil, then says if you can't get it any diesel engine oil will work fine in a pinch. I am going to change the oil and filter/s this weekend, so why would I NOT want to run something like Mobil 1 synthetic oil? The bike has less than 5000 miles on it, seems that now would be the time to switch.