The Rotax 912 was launched in the late 1980’s. Now I know that compared with the US engines which can trace their ancestry back to the 1930’s ground power units, that is not very old, but come on! The Rotax will always win the reliability war if it is being properly maintained. It removes the shock cooling problem and the “mags” are orders of magnitude more reliable and the product has much better (though not perfect) QA.
Rod1