Multigrade oils are designed to provide a more consistent viscosity across a wide range of temperatures. They are usually formulated around premium quality base stock (mineral and/or synthetic blend) enhanced with an additive package.
Today's automobiles have very specific motor oil viscosity requirements set by the manufacturer. Many cars use 5W-30 motor oil, but what do those numbers really mean? The first number in our example is 5W, which specifies that the oil must behave like a 5 weight oil (very thin and light) in cold conditions. It should flow freely below freezing so it can quickly reach unprotected engine components even after sitting for extended periods in winter conditions
The second number, 30 in our example, specifies that the oil must lubricate and resist breakdown like a 30 weight motor oil, which is quite a bit heavier and more viscous than a 5 weight motor oil. This indicates that it should be able to withstand the punishment of summertime driving without failing to properly lubricate the engine.
And what about the "W"? The "W" signifies winter, and is leftover from the days when cars had to run lighter oil for winter driving. Today it's just used to indicate the low temperature performance characteristics of the motor oil.

Motor Oil Properties :

MGM Oils, unlike industrial oils, operate in a severe environment and must be developed with unique properties. The primary functions of motor oil are:

• Lubricate engine moving parts to reduce friction and prevent wear.
• Clear engine of contaminants.
• Seal piston and liner for optimum engine efficiency.
• Resist high temperature degradation.
• Promote low temperature lubrication.
• Lubricate over a wide temperature range.

Features / Advantages:

• One oil for year-round use
• Improved low-temperature starting
• Improved overall fuel economy - less idling time and faster warm up
• Less battery drain on cold starts
• Faster, full-pressure lubrication over a wider temperature range