I run XD 50. There are two trains of thought on this...you will hear both sides depending on who you talk to. Basically, XD 100 is harder to find than XD 50 and costs twice as much. For me that is a no brainer. My dealer recommends XD 50 and regular maintenance...which I do. My 07 ETEC HO has over 700 hours on it now. Only problem I have had with it, is I had to replace the oil distributer last week....no other problems...that is a lot of hours with only that one minor problem. But, I do not run my motor WOT ever...and I do my scheduled maintenance ahead of time...about 100 hours ahead of time (scheduled maintenance is 3 years or 300 hours)



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