Viscosity is the thickness of the oil or resistance of the oil to flow.
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- Monograde oil protects your engine sufficiently at the operating temperature (SAE 30 - One Number)
- Multigrade oil protects your engine sufficiently at operating temperature and provides additional protection during start-up.
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- 5W-30 means that this is a multigrade oil. This is indicated by the two numbers separated by a "W"
- 5W - shows thickness/viscosity of the oil on a start-up - when you start the car (W - stands for Winter, this indicates oil performance under colder engine temperatures when the engine has not been running)
- 30 - shows the thickness/viscosity of the oil when the car is moving (operating temperature, when the car has been running)
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