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Ask Mobil Archive -
Viscosity
DateQuestionAnswer
10/20/2010
Difference Between 0W-30 and 0W-40 Oil
What is the difference between 0W-30 and 0W-40 oils?
From a viscosity standpoint, a 0W-40 motor oil will have a higher viscosity at high temperatures than a 0W-30 oil, while having the same viscosity properties at low temperatures.
08/24/2010
Switching Oil Viscosity due to Product Availability
Based on availability of particular viscosities of your product, is it all right to switch from one weight to another (i.e., 5W-20 then 0W-20)?
We specifically formulated Mobil 1 0W-20 Advanced Fuel Economy to provide the same high-temperature protection as Mobil 1 5W-20.  As always, please consult your owner's manual for the appropriate visc...
02/15/2010
How is Oil Viscosity Measured?
How is oil viscosity measured?
Viscosity is now commonly reported in centistokes (cSt), measured at either 40°C or 100°C (ASTM Method D445 - Kinematic Viscosity). The centistokes rating is converted into the SAE weight designation ...
01/29/2010
Oil for a Mazda Direct Injection Engine
Hello, I have a Mazda direct injection engine and I am trying to find one oil with low NOACK viscosity ratings. I am unable to find this information on the Mobil 1 5W-30 Product Data Sheet. Can you he...
Typical Mobil 1 5W-30, NOACK viscosity is 11-13%.
12/10/2009
Can Synthetic Motor Oil be Used in a Subaru Turbo?
Specific to my 2005 Subaru Legacy Turbo - the dealer discourages use of synthetic oil stating that the variable valve timing, which is oil pressure actuated, is adversely affected. The recommended wei...
There is no issue using Mobil 1 5W-30 for this application. We would add that changing viscosity grades could impact performance of the hydraulics of the variable valve timing, but not simply changing...
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