Description Castrol GTX 5W-30 RN17 is a high performance multigrade engine oil for petrol and diesel engines. With its special Castrol GTX Double Action formulation, it dissolves existing mud in the engine and reduces new build-up. Application Castrol GTX 5W-30 RN17 can be used in vehicles for which an engine oil according to the specification ACEA C3 or Renault RN17 in SAE 5W-30 is required. Advantages Castrol GTX 5W-30 RN17 offers: excellent engine cleanliness * high oxidation stability first-class base oils and anti-wear agents for a long engine life minimal oil consumption protection of exhaust gas aftertreatment systems * compared to the industry standard ACEA C3