The Most Common Engine Oil Viscosity
Across 4,104 US vehicle configurations in the GarageDex database, the most common factory oil grade is 5W-30 (51.6%), followed by 0W-20 and 5W-40. The shift toward thinner grades like 0W-20 is driven by fuel-economy standards.
Oil viscosity grades by share of vehicles
5W-3051.6% · 2119
0W-2030.7% · 1258
5W-407.3% · 301
0W-403.6% · 148
0W-303.3% · 137
5W-201.9% · 79
10W-401.2% · 49
15W-400.2% · 7
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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