What about all the different viscosity oils my owners manual says I have to use for different outside temperatures, seasons and climates; do I need to use different viscosity synthetic oils as well?
Synthetic motor oils have an exceptionally low pour point (typically around minus 60 deg. F for a premium quality 5W-30, 10W-30 or 0W-30) and an exceptionally high flash point and high temperature/high shear viscosity value. Petroleum oil cannot come close to matching these wide operating temperature ranges, thus necessitating different viscosities for different climates. When using a premium quality synthetic motor oil you do not have to change to a different viscosity for different climates.
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