I'm thinking about it. See, I got 2 old quarts of Pennzoil synthetic I found d at my local Napa months ago. The old bottles,around 2005 era. 10w30. I'm funny use those,and 2 quarts I'm thinking,of the Sunoco 10w30 synth blend.and half quart of Pennzoil ultra I used, found AutoZone clearance 2013.Franken brew it. I always wanted too try Sunoco ..so basically the place has the uktra,and synth blend. Ill do about 3000 miles over 6-8 months. Think this will do okay, variables outside,a d when summer comes..pressure,humidity 97 degrees? I should really be using full synthetuc,especially the stop n go do traffic here.