Occasional light knocking won't harm an engine. Heavy or prolonged knocking can result in a loss of power, overheating of parts in the cylinder and engine damage. Techron Concentrate Plus has proven to be unsurpassed at deposit clean-up for fuel injectors, ports and intake valves and combustion chamber deposits. It actually help restore performance lost due to deposit build-up. Most competitive additives do nothing to address knock, ping and run-on often caused by combustion chamber deposits. That’s why many auto makers around the world exclusively use Techron Concentrate Plus.