Time for another service and my wipers need replacing also. Halfords for 0W30 Castrol Edge C3 £47 per 4 litres. Costco is £30 for exactly the same. That's £34 saving for the 8 litres I've bought. Front wipers, £19 each for Bosch at Halfords. £7 each for Mitchellin at Costco. £24 saving. Total saving £58. That's crazy!!!