Best to stay with what the factory recommends. The manufacturer performed many extensive tests on your engine before releasing it for sale. There is plenty of good reasons to stay within manufacturers recommendations. I am not disagreeing with the other posters in any way either. Certainly their own personal experiences count in their recommendations. It is only that if you are not too familiar with oils, or their particular unique properties, best to stay "within the box," so to speak. As well, please, for the sake of your engine, never use those so called "mouse milk" oil from a cheapie seller. Use only good oil that meets the manufacturers specifications. No substitute for good oil. For myself, I met an Amsoil representative many years ago, and always used their full synthenic in my vehicles. But, that is only me, and no, I am not publicly endorsing one oil over another, just stating what I used personally. I always got a good price, and that is the main reason. Had he been handling some other oil, good oil, I most likely would have used that as well. Regular oil changes are the real key. Clean oil means a clean engine. Oil is the engine's life blood.