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Renault - Castrol GTX RN-SPEC 5W-30 RN 17 is a fully synthetic oil suitable for diesel and gasoline engines where RN 17 is required It meets high quality standards, facilitating optimum engine performance and extended component life by virtue of fast and effective lubrication across a wide temperature range. It’s more than just oil. It’s liquid engineering that protects against the problems your engine faces every day.