The Most Common Engine Oil Viscosity
Across 4,676 US vehicle configurations in the GarageDex database, the most common factory oil grade is 5W-30 (34.7%), followed by 0W-20 and 5W-20. The shift toward thinner grades like 0W-20 is driven by fuel-economy standards.
Oil viscosity grades by share of vehicles
| Rank | Viscosity | Share of vehicles | Vehicles |
|---|---|---|---|
| 1 | 5W-30 | 34.7% | 1,624 |
| 2 | 0W-20 | 32.2% | 1,505 |
| 3 | 5W-20 | 9.5% | 442 |
| 4 | 0W-30 | 9.1% | 425 |
| 5 | 0W-40 | 4.2% | 197 |
| 6 | 5W-40 | 3.7% | 171 |
| 7 | 10W-30 | 3.1% | 144 |
| 8 | 0W-16 | 1.4% | 64 |
Data as of October 2026, from 4,676 verified vehicle configurations. Compiled by Matan B., who runs GarageDex. Download the table as CSV.
You can use these numbers anywhere. If you do, please link to this page. Suggested citation:
GarageDex, "The Most Common Engine Oil Viscosity," data as of October 2026. https://garagedex.com/guides/most-common-engine-oil-viscosity/
Methodology
Counts reflect the primary engine's factory viscosity for distinct year/make/model configurations in the GarageDex database, each from a cited source. Many vehicles offer more than one engine; grades vary by engine and model year. Compare grades in our viscosity guides.
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