This substantially improved engine life and reliability, removed the fire hazard of the flammable ethylene glycol, and reduced the oil leaks that had been a problem with the early Merlin I, II and III series.
Dette gav en substantiel forbedring af motorens levetid og pålidelighed, fjernede brandfaren ved ren ethylenglykol, og reducerede de olielækager som havde været et problem med de tidlige Merlin I, II og III serier.