Liqui Moly Pro-Line Gasoline System Cleaner

One bottle treats a 30-70 L fill as a one-time flush or periodic maintenance pour. The brand claims injector, intake valve, and combustion chamber coverage for both port-injected and direct-injection gasoline engines. No detergent active is named in US-jurisdiction documents; SDS §3 shows only the carrier solvent system, so the coverage claim is based on brand marketing. Community results are consistently positive across diverse vehicles; no independent deposit test or SAE paper is on record.

Owners on non-Top Tier fuel with rough idle, hesitation, or sluggish throttle; the explicit GDI call-out is an above-average differentiator in this category. Skip it if you run Top Tier consistently; the OEM detergent package handles deposit prevention and this adds little. Skip it for mechanical misfires or injector failure beyond carbon fouling; professional cleaning is the right call. Not for diesel.

SDS §2: DANGER signal word driven by H304 (aspiration hazard), with H336 (narcotic effects) also present at mixture level. The isoparaffin carrier is low-volatility; outdoor pour exposure is brief, but an enclosed garage warrants ventilation. The product carries a Prop 65 warning for an aromatic solvent component. Do not induce vomiting if ingested; seek medical attention. The product combusts in the engine; exhaust is the environmental endpoint. Environment scores 2 due to the combustion pathway and aquatic-toxic aromatic co-solvents.