I suspect something else let go. I worked on lawn mowers for 35 yrs. and never saw a motor blow up in 10 mins because of the wrong kind of oil. Find out if you can where the broken pieces of metal came from. I've seen motors totally destroyed just because the butterfly screw fell out. The pieces in the crankcase are what destroyed the piston and cyl. Make like a detective and try to find out what let go and why. Such things as over reving can cause a motor to blow too, especially a 4 stroke.