Lucas Oil Fuel Treatment

Lucas markets this as a fuel system treatment and upper cylinder lubricant for gasoline and diesel engines. The SDS lists only a heavy paraffinic base oil carrier — the detergent package is withheld as a trade secret, so there is no basis for comparing the cleaning mechanism to named-active alternatives. The brand states the product cleans injectors and neutralizes sulfur; no SAE papers or third-party tests corroborate those claims. Dosing: 2–3 oz per 10 gallons every 3,000 miles.

Best for owners on non-Top Tier fuel in older port-injection or diesel engines who want low-cost maintenance. Skip it if you consistently run Top Tier gasoline (the OEM detergent package already covers this), or if severe fouling symptoms are present — professional ultrasonic cleaning is the right call, not a one-bottle treatment.

SDS classifies the full mixture as "Not classified" — no signal word, no H-codes. The paraffinic base oil carrier (flash point 232°C) produces negligible vapor at ambient temperature; no meaningful inhalation or contact exposure at the pour step. The Amazon listing carries a Prop 65 warning; SDS §15 names no specific Prop 65 chemical. The product combusts in the engine — exhaust byproducts are the environmental endpoint.