Castrol GTX Diesel 15W-40 Engine Oil 20L Castrol GTX is one of the world&rsquo,s most trusted engine oils. It's more than just oil. It's liquid engineering that provides extra protection against diesel engine problems, like soot and harsh deposits that your engine faces every day. Why is this important? Because soot and harsh deposits can make your oil thicker, block oil ways, cause wear and decrease performance. Help extend the life of your engine with Castrol GTX DIESEL. When choosing oil, please refer to your owner's handbook. The product specifications required may also be suitable for other vehicles Browse online using our handy Rego Search tool to find the best Castrol oils for your application or come in store today and speak to one of our friendly staff. Changing your oil will also need you changing your oil filter to fully protect your engine and maximise the performance of your Castrol oil. When it comes to Oils and Fluids, the range doesn't just stop at Magnatec, GTX or Edge, Repco stock a range of quality Castrol Grease, Transmission Fluid, Gear Oil, Lawnmower and Motorbike Oil, Marine Oil and Additives all designed to protect and maximise the performance of any application.