Why do so many workshops recommend Castrol to their customers? It’s simple. The best mechanics care about the oil that goes into their customers’ cars and motorcycles. They know that nothing protects engines better than Castrol, so they wouldn’t be happy recommending anything less. They understand that not every 0W-20 or 10W-30 is the same, because engine oil is more than just a commodity. They truly believe that liquid engineering makes engines last longer.