Opel
Oldsmobile and Opel are the only car manufacturers I can name that start with O.
Oldsmobile, Opal
Oldsmobile (Dodge) Omni Odyssey (Honda)
Jaguar
GMC, Geo,
Honda
Honda
Oldsmobile
· Odyssey (Honda) · Oldsmobile · Omega (Oldsmobile) · Opel · Octavia (Skoda)
seat and suzuki skoda and Saab
A herb beginning with the letter "o" is oregano.