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Are synthetic engine oils better than conventional oil at different operating
temperatures?
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Synthetic oils are primarily made from base oils that are more highly refined, producing an oil
with fewer impurities, lower volatility, and increased temperature performance or Viscosity Index
(VI). Viscosity Index is a measure of an oil’s change in viscosity resulting in changes in
temperature. Oils thicken at low temperatures and thin at high temperatures. Synthetic oils are
made with base oils that have a higher VI, meaning that they are more temperature stable with less
dramatic viscosity changes with temperature.
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This results in an oil that has improved performance at both ends of the operating temperature
range. The improved cold temperature and volatility performance allow for oils to be blended at
lower viscosities, such as 5W-30, as well as oils suitable for a wider range of temperatures, such
as 0W-40. Shell Rotella T5 10W-30 or Shell Rotella T6 5W-40 are an excellent choice for operators
of vehicle fleets in locations with large ambient temperature ranges - one oil to protect,
whatever the season and is the viscosity grade recommended for use by most OEMs. Both oils have
better low-temperature pumpability compared to conventional oil.
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Do synthetic oils provide better oxidation control than conventional engine oils?
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Synthetic engine oils offer better oxidation stability than conventional engine oils, which can
lead to a longer oil life. Oxidation is driven by high temperatures which make severe operating
conditions an excellent application for synthetic oils. Applications that have extreme operating
temperatures, and/or where a maximum oil drain interval is desired are areas that need the
improved performance of a synthetic oil.
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