At what mileage should I switch to synthetic? I have a 2008 toyota 4runner with a

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cgarcop

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V6. Mobil 1 or valvoline? I did the first oil change at 1000 miles using valvoline. Went to the dealer for a free oil change at 2900 miles and used valvoline again at 6000 miles. Is 9000 miles ok to begin using synthetic?
 
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