Long-term owners describe the F80 as among the most reliable M3s ever, with high-mileage and even 500-600hp examples running trouble-free and stock/lightly tuned cars needing no more than normal 3/4-series maintenance aside from a few engine gaskets in the 70-100k range.
S55 reliability and dependability reputation
BMW F80 M3 (2014-2018) · ownership