Everyone has a diff definition of âdestroyed engineâ for someone a dead motor is âdestroyed engineâ for me sluggish pick up, low fuel economy, and heavy noise at hi rev is âdestroyed engineâ so this is why i stay away from non recommended grades like 20W50. Rest its your car, your pocket, your choice. Moreover if you just search VVTi or VTEC engine on youtube you will know how tight the clearances are. There is a reason why 20W50 is a non recommended grade. In mianwali i have seen people pouring delo gold in their shiny new VVTi coz ustad gee said thicker the better. Their engines are running just fine no issue with that as well.