Obviously, there are different manufacturers having their own recipe for creating their engine flush. Depending on the brand choice and volume, you can find different offerings scattered in a price range of $7 to $30. For example, the famous Liqui Moly engine flush is mainly sold within a price range of $12 to $20. At this point, you just need to figure out what brand you are ready to put trust in and make sure that the chosen substance will fit the needs of your engine. Surely, expensive items tend to provide the strongest effect, though it does not necessarily mean that a cheap engine flush cannot cope with sludge and deposits covering your car’s engine.