What You Should Know About Motor Oil Viscosity Ratings

There is much that the average driver doesn’t know about their vehicle. Of course, this is only understandable considering that today’s modern cars, trucks and SUVs are far more technologically advanced than ever before. Still, while you may not need to know exactly how a limited-slip differential or gasoline-direct injection work, oil viscosity ratings are something every driver needs to understand.

Viscosity is a way of measuring a substance’s resistance to flow. Essentially, the less viscous an oil is, the thinner it will be and thus the easier it will flow. This is important as certain types of oil work better under certain conditions. For instance, most manufacturers recommend using an oil with a lower viscosity during the cold winter months, such as a 5W30.

Still, it is important to note that all motor oils actually have two viscosity ratings. The first rating before the W indicates the oil’s viscosity at 0° Fahrenheit, while the second number indicates the viscosity at 212° F. It is important to pay attention to both of these numbers, as motor oil is always much thinner when hot than when cold, and this will obviously affect how well it can perform its vital functions for your engine.

Nonetheless, there’s no reason to worry too much about viscosity ratings when you have your oil changed at Bob Allen Nissan in Danville. Our professional service staff will be happy to provide you with advice and will recommend the right oil choice for your particular vehicle.

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