Autoworld 1 August 2018 News, Products, Special offers, Vehicle products Offer on all Castrol products Autoworld 1 August 2018 News, Products, Special offers, Vehicle products Announcing this month's Autoworld offer - a generous 15% off Castrol world class motor oils. Maybe it's time to top up, or get yourself an oil change?! Offer open while stocks last, for one week only - from Thursday August 2nd 2018.