0w16 is more expensive than 0w20 Oil. Between 0w-16 and 0w-20 viscosity oils, 0w16 is more costly. The Oil is very thin, making it excellent for fuel efficiency. However, light Oil can't properly lubricate the engine's moving parts. Therefore, thinner oils are formulated to provide maximum fuel efficiency and safety. The difference between a 20 and 30 Grade is miniscule in comparison. There is no doubt that 0w30 is better than 0w20 in almost all engines and temperatures but its hard to find in many places and its usually more expensive. I've recently started to use M1 0w40 after my warranty expired and the dealer always used Dexos 0w20 despite living in Essentially 0w-30 does not protect your engine nearly as well as 0w-20 but is ideal for more extreme temperatures (temperatures of over 400°F). According to stikkitnow: While the 0w30 motor oil promises to protect your engine from tear, the 0w20 motor oil does this in a more outstanding and dramatic way. Motor Oil Viscosity. Motor oil viscosity means the range of the flow of the Oil inside your car's engine. For example, 0w40 means that the motor oil viscosity is easy to flow as it has a zero-weight grade during winter. The 5w30 is not wintered viscosity friendly; it means it works only during hot season perfectly. Yes essentially 0 & 5w20 are the same. Ohio gets cold but not enough for a 0 and 5w be noticeable especially if your vehicle is garaged. What's not the same are the oils. The 0w20 is a better-built oil. It's why most passenger vehicle manufacturers have opted-out of using 5w20 in the engine factory. Also, using thinner oils such as 0w20 or 0w30 on turbocharged engines that use 5w30 or 5w40 is beneficial to the turbos, because thinner oil will flow quicker and transfer the heat away from the turbo quicker. Many people think because they have a turbo engine, they should step the viscosity up a notch from let's say 5w30 to 5w40, but by doing Not a simple question. An SAE 0W-30 API SL Euro spec oil, like Castrol Syntec 0W-30, AKA GC is nothing like M1 0W-30. It is considerably thicker at operating temperature, but it also meets a variety of Euro specs, while M1 0W-30 doesn't. Using a Euro spec oil in an application not requiring it will cause no harm. 5w40 is more viscous than 5w30. V5w30 has a viscosity rate of five, while V5w30 has a viscosity rate of thirty. This means that 5w30 has a lower viscosity rate of five, while V5w30 has a higher viscosity rate of thirty. 5w40, on the other hand, has a viscosity rate of 30% and a viscosity rate of 40%. GF-6A is backwards compatible, meaning it encompasses GF1-5 standards as well and is designed for SAE grades 0W-20, 5W-20, 5W-30, and 10W-30. ILSAC GF-6B includes all the requirements of GF-6A, but it is only used for SAE 0W-16 grades. These ILSAC GF-6B approved products will display a new "Shield" API mark. The new "Shield" came at the Volkswagen Motor Oil Specifications. VW 500.00. Volkswagen specification for multigrade engine oils for gasoline engines with SAE 5W-X/10W-X viscosity. This is an "old" oil specification and is applicable to engines built before model year 2000 (up to August 1999). Oils with an approval made post March 1997 were given an alternative, later VW D0qwA.