I wonder where you get your Oil expertise? . I can't see one sign of you taking onboard what anyone here has said and Now as usual , you get into insults. Advising what the Manufacturer says is doing the optimum safe action. Near enough is good enough is not the DEAL with oil type these days, particularly with this series of engines. You are also defaming the RAAus Person . He's acting responsibly . YOU are NOT acting responsibly and if someone acts on your advice and comes to grief YOU might be considered responsible at Law. Think on that. Nev