The h22 cast pan is a little deeper. So It needs a longer dipstick. Both pans still hold the same amount of oil. Is your pan silver or black? Silver is a cast aluminum pan. Black is the normal steel pan.
thing is, when i pour in 5 quarts of oil (recommended h22 amount), my dipstick shows too low. i'm not sure what the dipstick is from. I thought it was the oem one but guess i was wrong.