+1. The "V-Twin" part is important. I have found that, S&S recommended, Mobil 1 V-Twin 20W50 fully synthetic oil is unobtainable in the UK, unless you order a box of it from the US. I have used Spectro Platinum 20W50 V-Twin fully synthetic oil from Matts Machine Shop, their alternative. I am now using Motul 7100 4T V-Twin 20W50 fully synthetic, same specification as the Spectro, better price and availability here. Apart from some very fine "paste" on the mag plug at the first change I did at 500 miles, not a hint of any metal debris yet at the oil and filter changes. Over servicing the oil is still cheap when compared to the cost of the engine.