Merc builds F/I cars.
Porsche builds F/I cars.
Toyota built F/I cars.
Audi builds F/I cars.
All four have incredibly reliable machines. If an engine is properly built up in the bottom end (crank, rods, pistons) and top end (heads, valvetrain) and the block is iron, the motor will last a very long time if maintained properly.
For example, 2JZ-GTE (Supra TT mkiV motor) STOCK can take 22-25 psi. Its an iron block, with completely forged internals. Those motors are considered some of the best the world has ever seen.