Some specs of comparing engine life with "apples to apples." That is comparing engines in the same duty class. B10 engine-life rating means 10% fail and 90% do fine. B50 means 50% fail before the first rebuild under heavy use.
The 5.9 Cummins "straight-six" diesel has a B10 rating of 210-250,000 miles and a B50 of 350,000 miles.
The Ford and IH diesel 7.3 (or T444E) V8. B10 rating of 210-250,000 miles and a B50 of 350,000 miles.
Chevy Duramax V8. Has B10 of 220,000 miles
I.e., they all have the same projected engine life.
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