Castrol has made its first investment by backing online repair marketplace RepairPal.

Castrol InnoVentures, the corporate venturing unit of oil major BP’s motor oil and lubricants division, has made its first deal by co-leading a $13m series B round for US-based RepairPal, a website for auto maintenance and repair information.

The other co-lead in the B round was Cars.com, a division of Classified Ventures, which is owned by media companies Washington Post and AH Belo.

Since being founded in 2007, RepairPal has raised $20m, which includes $4m in its A round, led…