Since you're in Arizona I don't think that there will be a big difference between 10w30 or a full synthetic. Since you asked the question, and I had never figured it out, I did the math on my oil consumption over the years and it wasn't pretty. I switched to synthetic right when I bought the VX at 35,000 miles. I replaced the engine at about 140,000 miles and it drank 3/4 of a quart every 350 miles. So 140,000 minus 35,000 equals 105,000 miles, divided by 350 equals 300 times that I used 3/4 of a quart of oil. So 300 times .75 equals 225 quarts used at $7 (conservatively) per quart equals $1,575 spent on oil outside of oil changes. OUCH!
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