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When I change my oil, I buy the filters at Toyota and buy the oil at Walmart. Buy a good brand name oil such as Vavoline. I use the synthetic blends, but that's just my choice.
If you want to bring it to someone to have the oil changed, I'd go to Toyota. I'd never bring my car to Walmart to have it serviced, for any reason. Like Brian said, the best option is to bring it to someone you know and trust.
As for fuel consumption, in cold weather it will get less milage, especially if you only drive it short distances. How's the milage on the highway over a longer distance?
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