Redline SI-1 Fuel System Cleaner

I ran 16 fuel system cleaners through a head-to-head tournament. Primary source data only — Safety Data Sheets, PEA concentrations, chemistry transparency. Redline SI-1 won.

Here's why it earned it. Redline is one of the only brands that actually discloses their PEA concentration on the SDS — 30 to 40%. That's the active ingredient that actually cleans carbon deposits off intake valves. Most brands won't tell you what's in their formula at all. Redline puts it in writing.

This is what I run in my own vehicles and what I recommend without hesitation. One bottle per oil change interval is the protocol that makes sense based on the chemistry.