I’ve got 2011 50 with 279,000 and doing fine. Got a 2016 with 5.0 and 105000 with no problems! I change oil every 5000 miles in them great engines and no problems with transmission
I put 276.000 miles on 2011 150 and it is still running today with only maintenance at every 5000 miles. My 2016 has 93,000 with only maintenance every 5000 till the wheel nut replacement! Both trucks have 5.0 engines.