Red Line SI-1 Complete Fuel System Cleaner

SI-1 uses PEA (the detergent class most studied for injector deposit dissolution and intake valve carbon removal), confirmed directly in the US SDS. Protocol: full bottle into a near-empty tank for initial cleaning, then half-bottle every 1,500 miles for maintenance. Community evidence is specific: a long-running BITOG thread includes borescope images of GDI intake valve deposits before and after treatment, with follow-ups at 3,000+ miles. No product-specific SAE paper or dyno test found.

Best for owners running non-Top Tier fuel who want a concentrated PEA treatment · one-tank flush for suspected deposits or a 1,500-mile maintenance cadence. GDI owners with intake valve carbon concerns are a strong fit. Skip it if you always run Top Tier certified gasoline, which already includes the detergent package that prevents deposit buildup. Skip it for severe rough idle or stalling · one bottle is not a substitute for professional ultrasonic cleaning.

SDS §2: WARNING with H315 (skin irritation), H317 (skin sensitizer), H319 (eye irritation), and H412 (aquatic toxicity, chronic). No respiratory H-codes appear at mixture level · the low-volatility carrier means inhalation exposure during the pour is negligible. The product listing carries a Prop 65 warning; SDS §15 names the specific Prop 65 substance. The product combusts in the engine · exhaust byproducts are the environmental endpoint.