Oggy owns an orange 1960-70s Volkswagen Beetle that is mostly used in Season 4 but you can see it in some episodes of season 3. The car was originally Bob's. But apparently Bob owns a different car as seen in Grease Monkey Oggy and To Serve and Protect.
Oggy's other cars
Also The 2004 Toyota Hiace Purple with a front end of a Hyundai Starex which was seen in the episode The Pumpkin that Pretended to be a Ferrari.