Well its sort of like this.+ " What's the difference between Kinky sex and normal sex ?" The anwser is ---- About $15.00 :lol: At one time long ago " Kinky Sex cost a little more.
Some folks say the "HD " on the can means Heavy Duty , some think it means High Detergent. I have seen more cans marked Non-Deregent than marked High Detergent. Most all the major brand muti-viscosity oils are High Detergent. I don't even think there is a 10w30, 20w50 etc. Non-detergent oil . I might be wrong. GTX is High detergent though.
All this info is for normal people . Smelly Cat makes his own oil thanks to his buddy Frank and his Hound Dog. :lol: