Should one seriously consider switching to HD synthetic oil vs. the regular HD oil. If yes, is the HD’s the best choice, who makes it and what is its quality vs. other brands? When is the best time to switch? My 03 V-Rod has only about 1,400 Km and will be reading for its first service at 1,600 km. I expect to bring her in in March on a good day when the weather imporves here, it is now about -20 celcus and going down to -30 tonight.