It's called SHELL LUBRICANTS and it is one of the best things that could have happened. Product quality has gone up on all 3 brands and some really exciting things are being looked at with some new synthetics.
The Slick 50 thing was marketing and I was probably more upset about it than anyone. I sold against this product for 20 years until we purchased Quaker State in 1995 and since then, I have not tried to sell any of it. The good news is, this product is going bye, bye. We are selling it, but I do not know to whom at this time. I wish them well. A good formulated oil does not need any kind of additive to help it out.
I'm sorry if you have lost your confidence in these 3 products. But then, we just can't please everyone.