Valvoline Conventional
5w30 in Winter
10w40 in Summer
Studies have shown Synthetic Blends offer no better, and sometimes worse performance than conventional oils. No teflon goes into my engine, it doens't belong in there. In fact, the manufacturer of Teflon (Dupont) actually recommends AGAINST using it in engines.
With the kind of mileage I put on my cars, the additional $100 a year to run synthetic seems a little steep. Especially since I've driven several cars in our family with up to and beyond 200,000 miles that ran on the regular stuff.
There are a lot of people, and a lot of different opinions. Kinda interesting to see how they all turn out though.
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