Castrol GTX 10W-30 Engine Oil 5L Castrol GTX 10W-30 is suitable for use in automotive petrol engines where the manufacturer recommends an API SP, ILSAC GF-6 or earlier specification 10W-30 lubricant. ,Help extend the life of your engine with Castrol GTX. Poor fuel quality, heat and frequent short trips can all lead to sludge that potentially shortens engine life. Sludge is a ,sticky deposit that can block your engine&rsquo,s vital oilways and if untreated it can rob an engine of power and, ultimately, its life. Castrol GTX with 3X CLEAN formula works to Catch, Control and Clean dirt from engine oilways, keeping your engine cleaner for longer and helping to extend engine life. Castrol GTX also protects against new sludge formation better than tough industry standards. 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.