While I respect Mr. Burla; he doesn't know everything ... strange but true.
Good article
Explore the five key differences between 0w-20 vs 5w-20 oil, including their viscosity, performance, fuel economy, pricing, and some related queries.
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C. Performance
Both 0W-20 and 5W-20 are thinner oil grades that perform best in low temperature winter climates.
0W-20 oil grade (due to its lower viscosity) is better with cold starts. It also prevents problems like sludge buildup, engine wear, varnish deposits, and low oil pressure. You can expect faster oil circulation with 0W-20 and a smoother flow.
So if you’re going to be driving a lot in below-freezing temperature climates and rarely drive in warmer temperature climates, 0W-20 oil grade would be ideal for you.
On the other hand, 5W-20 has a higher viscosity and performs slightly better in seasonal climates. It’s a slightly thicker oil and is more resistant to oil thinning at hotter temperatures.
Note: Some cars can take both 0W-20 and 5W-20 oil. But before you switch to a different viscosity grade, speak to your mechanic about the recommended oil for your car.