The primary difference when looking at 5W-20 vs 5W-30 is their viscosity once your engine has reached operating temperature.
Oil viscosity is the measure of its resistance to flow. How quickly or slowly motor oil flows affects how well it protects your engine.
It’s best to use the viscosity recommended in your owner’s manual, but a slightly thicker oil or thinner oil likely won’t do lasting harm.
When deciding which oil to use in your car, ensure you use the correct viscosity of oil that meets the correct performance specifications.
Using a lighter motor oil viscosity in the winter can improve cold starts and maximize wear protection at startup. We provide all the details here.
Synthetic oil allows for lower viscosity without compromising wear protection and better cold-flow, both of which improve fuel economy.
A lubricant’s viscosity and how it changes under different temperatures and operating conditions is one of the most important properties that determines lubricant performance and protection.