Englishal
By the time you eliminate failures due to fuel and reasons that could easily have been prevented, partial failures, a raft of failures that could have been forseen and prevented (it never ceases to amaze me how many people are aware of issues that could result in engine problems and yet continue to fly - low oil pressure etc) and failures in higher risk circumstances (test flghts and the like) I am assuming that statistically an engine failure of 1:100,000 hours is made typical. Clearly I am not "typical" but at least stats like that are a comfort.
I am aware that huge numbers of PPLs never even make it to 2,000 hours so the vast majority are going to be very unlucky to see an engine failure in their entire "career" not only as part of the flying they do but also as part of the flying of all of their friends.