5W-20 grade oil, and Mobil 1 has a synthetic 0W-20 on the way in March 2003. Some say 5W-20 is too thin to protect the engine, and that the manufacturers are recommending it because it improves gas mileage slightly. On the other hand, I have heard the opinion that the thinner oil gets into the cylinders of these engines faster and better than a heavier grade would, and Ford says it will void the warranty if you use a grade other than 5W-20 when this grade is called for. What are your opinions?
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