Based on the search results, the most commonly available and affordable Helix engine oil is the Helix HX3 20W-50 Multi Grade Oil, which is available for R319.99 per 5 litre bottle from PriceCheck. The Helix HX3 is a good multi-grade oil that can be used in a variety of vehicles and conditions. For drivers wanting a full synthetic option, the Helix HX8 5W-40 Fully Synthetic Motor Engine Oil and Helix HX7 10W-40 Synthetic Technology Motor Engine Oil are both available for R459 and R670 respectively per 5 litre bottle. These synthetic blends from Helix will provide good protection for the engine. I hope these price details on Helix oils help you select the best option for your needs. Let me know if you require any other information.