Hey all Question : I am service Manager at a Honda dealer, but honda is very uninformative when it comes to oil grade required, other then confirming it is API rated for gas engines, lol She does all highway, 70km each way a day. Vehicle has 53,000km and is a year and a half old roughly. We have had fuel dilution issues on some 1.5T engines, hers however hasnt shown excess signs of this, likely due to highway driving and full heat cycles. I do the oil change at 50% oil life and then at 15% with whatever Maint minder is calling for - usually 8000km between every oil change (5000miles). I am using OEM honda filter with OEM honda bottled oil. My question is, due to GDI Turbo issues, is there a better fchoice? Castrol 0w20 new formula for "GDI Turbo", Amsoil signature series? Any suggestions? Vehicle also only gets Shell 91 gas with 0 ethonal and every 5000 Royal Purple Max clean DI injector treatment. Thanks!