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2torial #0601:
Learn2 Change Your Oil (Continued)
 Choose your oil
Motor oils are defined by grade. Today's
oils are generally multi-grade, which means
that they are suitable for use in a range of
temperatures.
For instance, when an oil is specified as
"10W40," the first number is a measure of viscosity
(resistance to flow) at lower temperatures, while
the second number is a measure of viscosity at
higher temperatures. A rating of "5W30" would
indicate an oil that flows more easily at both low
and high temperatures than a "10W40." In short, the
higher the grade, the thicker the oil.
Many people prefer heavier oil (greater
viscosity) for protection in hot weather and
lighter oil (lower viscosity) for use in freezing
temperatures. The best selling grades in the U.S.
are 5W30 and 10W30 oils. If you're still unsure,
read over the owner's manual again or consult a
local mechanic.
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