Chris-
I'm sure you'll be fine. I'm pretty sure it refers to engines that have run the same thing for 50k or more.
Let me put it another way.
I have 7 cats. The five youngest ones eat whatever cat food is on sale. It changes month to month. They are no worse for it, and don't show any signs trouble due to their frequently changing diet. In fact, they are healthy and happy (actually, one is sick, but that's another story, and it ruins my analogy). The two oldest cats, on the other hand, have been eating the same brand and style of cat food for the past 5 years. If I were to change cat food on them, they'd start puking right away.
Get it?
Take care,
-Chris
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