5W30 or 10W30 is fine. Besides, the manufacturer recommends 5W30 but the deler will tell you that 10W30 is okay too. Do you change your oil every 3,000 miles? If so, spending the extra money on synthetic won't make any difference on your car unless you drive it hard. IMO, the only reasons to use synthetic are if you drive your car hard or you go a long time between oil changes. 100% synthetic is good but it's not necessary.
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