No oil companies put the group rateing on the jug that I am aware of.
Rottela 5-40 is a group 3 oil.
The only group 4 oils that have been confirmed at this point are all the mobil synthetics.
Most of the amsoil, but not all, I beleave the amsoil 15-40 is a group 4.
Alot of group 3 oils are very good, just watch the price and compare to the group 4 oils.
According to another thread Redline is group 3 oil.
The word is still out on Royal Purple, At one point in time I beleave they were a Group 4 but things have changed and they could be blending to make up more profit, when I find out for sure I will pass on the information or just follow the other thread.
Ron