Red Line vs. Seafoam: Which Fuel System Cleaner Wins?
Quick Answer
Red Line SI-1 is the superior choice for cleaning injectors, GDI engines, and carbon buildup due to its high PEA concentration and full detergent package. Seafoam excels as a versatile stabilizer, moisture remover, and preventive maintenance additive for small engines, marine engines, and long-term fuel storage.
Why These Two Cleaners Dominate the Market
Fuel system cleaners fall into two major categories: PEA-based deep cleaners and petroleum-distillate-based stabilizers. Red Line SI-1 sits at the top of the PEA category, offering real carbon removal. Seafoam is one of the most trusted general-purpose cleaners and stabilizers for engines that don't need heavy-duty chemical cleaning.