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Stealthalero and 3.4 are right, once you switch you can't go back. I have been running mobil one for three years and 65,000 miles. the engine runs better and smoother. I had a tech at autozone ask me this. I was there getting a DTC number and he asked me to start the car, I told him that it has been running the whole time we were out here. He replies, wow that thing runs quiet. The nice thing about synthetic is that you can go longer between changes and it is a better product.
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