Castrol was a major sponsor in the motorsports world BP is selling a $6bn (£4.4bn) stake in the historic British engine oil business Castrol in an effort to pay down a mountain of debts. The oil giant confirmed on Wednesday that it was selling a majority stake in the lubricants company to Stonepeak, a New York-based investment firm. It is the biggest sale by BP in 12 years and comes as the company is in the midst of a major leadership shake-up. Castrol, founded 126 years ago, became a household name t ...