Slick 50...still good stuff? I have heard that the formulation is not the same as it once was.

it has been improved, it's now in a lighter oil base that fits modern car needs.

Awesome! So with my 2010 Corolla...I should just add the whole bottle...15oz...in place of 15oz of oil?

yes, but be sure to get the modern classic formula, the old oil was too heavy they used for the carrier medium

I got the synthetic advanced formula...I would asume this is the new stuff