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My dealer told me Mazda specs a semi synthetic 5w-30 (they are pushing Valvoline) over a full synthetic 5w-30 for this turbo engine.
Their explanation indicated that the semi synthetic is better for turbo engines. I am not buying it. It goes against all I know about oils. Nothing online that I can find that indicates turbo engines should not run full synthetic.
As of now, I plan to use full synthetic on my next change with a WIX 51359 Filter. Any others run into this seemingly BS advice or maybe I am wrong?
 
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