I can remember when Honda moved 5 “points” (I guess you call them points) in viscosity rating for what to put in certain vehicles. It was a move from 5/20 to 10/20 or 10 to 5 ,some very minor move, and management was on us hard to use the right oil in the right car. Now a move from 5/30 to 20/50 that is quite a move, and one that needs an explaination.