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How often to change fully synthetic engine oil?

23K views 155 replies 32 participants last post by  securityguy1  
Walmart...5 qt jug of most all high quality synthetics is around $22-$25 so about $5/qt. I change my oil every 5K miles religiously or every 6 month. Cheap insurance.
For me in Canada, Mobil 1 on sale at major retailer is 36 bucks CDN for the 4.73/5qt jug. I used it in my gas trucks and use it in my wife’s Buick. Rotella T6 18.9l pails on sale are $160 CDN for my Duramax.