1. ExxonMobil: Recognized for their Mobil brand of lubricants, they are a global leader in the oil industry.
2. Royal Dutch Shell: Popularly known for their Shell Helix and Pennzoil brands, Shell is a multinational energy company.
3. BP: Renowned for their Castrol brand, BP produces a wide range of engine oils for various vehicle types.
4. Chevron: Known for their Havoline and Delo brands, Chevron is a multinational energy corporation.
5. TotalEnergies: Total Quartz and Elf are among the famous engine oil brands produced by TotalEnergies, a French multinational integrated oil and gas company.
6. Phillips 66: Their premium engine oil brand is known as Kendall. Phillips 66 is an American multinational energy manufacturing and logistics corporation.
7. Valvoline: Valvoline is a leading global producer and marketer of automotive, commercial, and industrial lubricants.
8. Castrol: Predominantly owned by BP, Castrol is one of the world's most recognized brands of lubricants.
9. Aramco: Saudi Arabian Oil Company (Aramco) is a Saudi Arabian national petroleum and natural gas company and produces a range of engine oils.
10. Petronas: Petronas Lubricants International, a subsidiary of the Malaysian national oil and gas company Petronas, produces a variety of engine oils.