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Slick FluidsSynthetic oil can reduce internal friction, and increase power and fuel mileage. Synthetic trans fluid and differential gear oil can also help. AmsOil (www.ams oil.com) charges between $8 and $12 per quart for a variety of these products. Note the oil shown is advertised as safe for flat-tappet cams as well, easing a real concern for all vintage Pontiac owners.