Pennzoil Ultra if you can find it is really good for about 60 on 10 quarts. Amsoil did a oil comparison in feb this year and while PU wasn't the best it was in the top performers. Oddly enough M1 extended performance didnt fare as well as I thought it would have and I've been using it (or similar full synthetic m1) for the last 10 years!
http://www.amsoil.com/performancetests.aspx
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