![]() ![]() ![]() This is especially helpful when the vehicle is in cruise mode running down the freeway at 65 mph where the road load horsepower requirement is probably less than 20 hp. The idea was to design a system where the onboard engine computer could deactivate four cylinders simultaneously. Now for MDS - How the Multi-Displacement System Works But at low temperatures, the 5W-30 oil flowed more easily. However, laboratory tests measured the viscosity of oils under high-temperature, high-stress conditions and found essentially no difference between 5W-30 oils and their 10W-30 brand mates. The W designation means the oil can be used in winter.Ī popular belief is that 5W-30 oils, despite their designation, are too thin to protect vital engine parts when they get hot. The second number, 30, refers to how the oil flows at high temperatures. The first number, 5, is an index that refers to how the oil flows at low temperatures. In 5W-30 oil, for example, the two numbers mean it is a "multiviscosity" or "multigrade" oil that is effective over a range of temperatures. The lower the number, the thinner the oil and the more easily it flows. ![]() Automakers specify grades according to the temperature range expected over the oil-change period. The top number simply means how well it holds up under heat.įirst - Ideally, oil should be thin enough to flow easily when an engine is cold and remain thick enough to protect an engine when it's hot. I should not have assummed oil viscosity was understood by everyone.
0 Comments
Leave a Reply. |