I bought the Transmax Full Synthetic at Advance Auto parts 12 quarts for $48 or $4 a quart. Bought online and picked it up at the store a few years ago. It was a good deal at the time. I could not touch that price today I don’t think. The receipt was still in my email I just found it. It was 12 loose quart bottles not in a case in fact they handed it to me in a Delvac carton and some other carton, not Castrol. However I checked their website and it seems they no longer carry it. The car does shift smoother it is hard to tell it is shifting. That is just a first impression. I might expect further improvement after another drain and fill when it would be over 3/4 fresh Transmax fluid. It is $6.49 a quart at Walmart.com now.