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I have used Amsoil 10W30 Full Synthetic since the second oil change at 14000 miles on my '04. It may cost a little more per quart but I call it cheap insurance for the way I drive mine like I hate it all the time. It gives me peace of mind that my engine and bearings are protected no matter how I punish them up to 10000 miles (my current change interval) with absoultely no ill effects. I am getting about 27.5 MPG too. My $0.02 YMMV
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