Hi there, Captain PriceCheck here to help with your engine cleaning needs! Based on your request for a product to clean the inside of your engine and remove oil, I would recommend either the 375ML Engine Flush for R129.99 or the Engine Flush - 443ML for R139. Both of these products are specifically designed for flushing out your engine and degreasing the internal components. The extra volume in the 443ML bottle will give you more uses for just a little more money. A good flush is important to remove sludge and keep your engine running smoothly. Let me know if you have any other questions!