Lucas Deep Clean Fuel System Cleaner (16 oz.)

When your engine starts pinging under load or your fuel economy drops off for no clear reason, carbon buildup in the fuel system is usually the culprit. Lucas Deep Clean Fuel System Cleaner works through the entire fuel path — from injectors and intake valves down to the piston tops and combustion chambers — dissolving the deposits that cause knocking, rough idle, and wasted fuel.

A single 16-oz bottle treats up to 30 gallons of gasoline. The formula is alcohol-free and low-odor, and Lucas specifically notes it is safe for oxygen sensors, so there is no risk of triggering a check engine light. Beyond cleaning, the additive lubricates fuel pumps and piston rings, which helps reduce wear in higher-mileage engines. It also reduces NOx emissions and can eliminate the need for higher-octane fuel in engines that have started requiring it due to deposit buildup.

Pour the full bottle into your tank before filling up and drive normally. Most drivers notice smoother throttle response and quieter combustion within the first tank. For engines with heavy buildup, a second treatment on the next fill-up helps finish the job.