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RIGHT OIL WILL SEE YOU THROUGH THICK AND THIN

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Judge the oil you put into your engine by the way your engine sees it, says Dennis Boggs.

"Anything colder than 60 degrees Fahrenheit is a cold start from the engine's viewpoint, so your first step in oil selection is viscosity, which refers to the natural thickness of the oil, or its ability to flow."Boggs, of Phillips 66, adds, "Oil naturally thickens when it is cold and it naturally thins when it is hot."

If oil is too thick, an oil pump can't create enough pressure to force the oil where it is needed. If it's too thin, it won't coat engine parts as it should. Thick oils work better in high temperature situations while thin ones are best at low temperatures.