It has been discontinued. I think it is now available as a professional oil treatment. There are sometimes stores you will still find it in. In my area in pittsburgh, advance, autozone are all out of it now where pepboys still has tons of it.
I have been looking at this new stuff they offer
http://www.valvoline.com/pages/products/product_detail.asp?product=20
Its valvoline Synpower Engine Treatment. It claims:
SynPower Engine Treatment is a premium synthetic product, compatible with all motor oils, that helps motor oil with the difficult job of protecting engines especially at very high and very low temperatures.
* Helps prevent lost horsepower
* Helps maintain cleaner engines
* Improves oil flow at low temperatures during start-up
* Improves engine oil breakdown resistance
* Contains the most effective friction modifier
* Compatible with all engine oils
Part Number 068
Size 32 oz
UPC 74130-00068