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Ask Mobil Archive -
General Lubricant Info
DateQuestionAnswer
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 ...
01/05/2010
Explain the MRV Lab Test for Motor Oil
What does MRV @ -40°C mean?
MRV @-40°C, which stands for Mini-Rotary Viscometer, is a lab test that measures the oil's ability to flow (pumpability) at -40°C. The lower the viscosity grade, the lower the temperature at which the...
08/27/2009
Motor Oil the Consistency of Chocolate Pudding
What would make Mobil 1 synthetic oil turn to the consistency of chocolate pudding?
This can occur with any oil if there is a lot of water or anti-freeze (coolant) added to it along with the byproducts of engine combustion. Also see our answer on how moisture gets into motor oil.
08/04/2009
How Does Water Get in Motor Oil?
How does water get in the engine oil? Does it blow past the pistons or valves? Does water in the oil indicate the possibility of a blown head gasket?
Water can get into the oil two ways. You generally don't have to worry about one of the ways if you drive your car enough to burn off the water during normal driving.  This drives off the moisture tha...
06/16/2009
Should ATF or Motor Oil be Used in a Harley-Davidson Primary
I understand that there are some people who are touting the benefits of using ATF in a Harley primary. What are your thoughts on using ATF in the primary vs your 4T 10W-40 motorcycle oil?
Automatic transmission fluid (ATF) would probably work fine in your primary but in the end you will have to decide if you are satisfied with its performance.  Every biker “feels” his shifts and knows ...
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