Honestly, this blanket statement has zero to back it up.......feel free to post a reputable study.Thank your government then for reducing your engine lifespan from 300k to 100k.
Listen, if people did as they are told we would all live in the gulag of the USSR at this point. People who blindly follow the rules without quesitoning their reasoning are stupid. Yes. Stupid. Even engineers KNOWINGLY will tell you to do something if held at gun point or the risk of LOSING THEIR JOB
If its a naturally aspirated dual injected old school motor, I am sure 0w20 would be fine, but on a turbocharged GDI engine? The germans already went through that and I refuse to lose money on honda's behalf.
0w-20 engines , DI turbo included, can easily go 300k, many here have done so.
0w-20 Is more than adequate.