「四輪車」 means an automobile or four-wheeled car but we don't use it in daily conversation. We don't say "We go there by 「四輪車」。”This word is used at places such as driving school or police station .　Usually, we prefer to use 「車」。「自動車」seems good to use daily, but when we say 「車」, it means 「自動車」,so we usually just say 「車」. 「カー」is a word just read and write "car" in Japanese way, so we don't use it formally.

Huurauto's noemen we wel: レンタカー、Of　カーデイーラー、;)