The blue bottle Rotella is a good oil, ya maybe not as good as Amsoil, but its still a full synthetic. Wal-mart has it for $19 a gallon. With your veg oil thing going on, you could still push the oil change interval to say 5000 miles. It will still be better for your engine. I change mine every 5000 but I also run the crap out of may car and blow smoke constantly so it gets pretty sooted up!
Jason
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