The difference between 10w-30 and 5w-30 oil is the thickness of the oil during cold weather conditions, 5w-30 being the thinner of the two and therefore recommended for colder operational climates. Engine oil is rated on a viscosity scale by the Society of Automotive Engineers, which determines its cold- and warm-weather rating; the cold rating is indicated by a “w” for winter.Know More
Automotive oil manufacturers currently produce multigrade oil, which means it behaves differently at different temperatures. The Society of Automotive Engineers grades oil based on its performance at different temperatures by measuring the amount of time it takes to flow through a length of tube. Oil that takes 30 seconds earns a grade of SAE 30. Lighter-weight oil passes more rapidly through the same tube but thickens under colder temperatures, allowing for better performance. Therefore, an SAE 10w-30 performs like grade-30 oil during warm temperatures and grade-10w oil in colder climates.
In the past, oil manufacturers only offered single-grade oil that needed to be changed for seasonal operations. Heavier oil that offered good performance in the summer would have to be changed for lighter-weight oil for easier starting in the winter. A single-grade oil has one number to signify its viscosity, such as SAE 50 or SAE 10w.Learn more about Engine Oil
The difference between 5w-20 and 5w-30 oil is that 5w-30 oil has a higher viscosity at its operating temperature. Viscosity is the term used to describe the thickness of a substance, in this case oil, where a higher number indicates a thicker oil.Full Answer >
The two oil types differ in their high temperature viscosity, and 10w40 is thicker than 10w30 when it comes to high temperatures. Before multi-grade oils were formulated, car owners typically used 10w30 for its wintertime flow properties, while relying on the 10w40 for the summertime when temperatures warmed up.Full Answer >
Synthetic oil may last anywhere from 5,000 to 7,000 miles before it needs to be changed, although some brands may last as long as 10,000, 15,000 or even 20,000 miles. Change interval length also depends on factors such as road conditions and trip mileage.Full Answer >
Some of the disadvantages of oil are that it is a nonrenewable resource and creates air pollution. It also is often produced by countries who are unstable politically, and it can be harmful if spilled in the ocean or some other wildlife habitat.Full Answer >