Ha, I went changed my to Napa Syn 0w-20 after reading this today. It's $3.49 a qt, or $20 for 5 qts Syn and a filter. It's the same as valvoline, made by Ashland
http://www.valvoline.com/pdf/synpower.pdf
Interestingly, the 0w-20 nearly the same viscosity as 5-w20