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⚡ Unleash the full potential of your engine—because average just won’t do!
104+ Performance Max Octane Boost & Lead Substitute is a premium automotive additive designed to elevate your fuel’s octane rating, clean fuel system deposits, and reduce engine knocking. It acts as a lead substitute, protecting your engine while improving gas mileage and overall performance. Compatible with catalytic converters and oxygen sensors, this product ensures a powerful yet safe upgrade for your vehicle’s fuel system.



| ASIN | B000CCMMCK |
| Best Sellers Rank | #81,773 in Automotive ( See Top 100 in Automotive ) #18 in Octane Boosters |
| Brand | 104+ |
| Customer Reviews | 4.7 4.7 out of 5 stars (166) |
| Date First Available | July 7, 2004 |
| Item Weight | 15.9 ounces |
| Item model number | 10410 |
| Manufacturer | Gold Eagle Co. |
| Manufacturer Part Number | 10410 |
| Model | 104+ Performance |
| Product Dimensions | 9.63 x 8 x 7.81 inches |
| Special Features | Acts As A Lead Substitute, Cleans Fuel Injectors and The Complete Fuel System, Maximizes Power and Improves Gas Mileage, Reduces Knocks, Pings, and Hesitation, Safe For Catalytic Converters and Oxygen Sensors |
C**Y
No hardened valves seats NO PROBLEM
Does what it says. Trust in the science behind it. Running this product in several engines built before the 1970s that have remained in continual operation since new. Gives you the lead substitute chemical plus an additional "stated" octane boost. We have our engine oil analyzed proactively and we are not seeing any abnormal signs of internal engine degradation. Easy to add when fueling. The goal is routine operation of your aging vehicles with a sustained heat cycle. Machines are like the human body; use it or lose it!
U**S
Old School Product That Just Works
MY high compression 455 Olds loves this stuff used it for years includes lead sub for the valves!
R**N
If you have an older car this is a must have!
I have two old cars with soft valve seats. They need lead to lube the top end and avoid excessive wear. Ethanol gas (10%) is murder. Use this and SeaFoam (or similar) to mitigate this issue. You might get strange looks at the gas station, but who cares.
J**Z
Excelent
You can actually sense the improvement.
A**R
Shipping
There is nothing wrong with the product, but it was shipped in a soft bag and had been damaged enough to cause leakage. The ups carrier gave me the option to refuse delivery but the leakage was only about 1oz and I accepted it
R**R
Professional
Awesome customer service! Professional item ...says all. Thanks!
R**L
Great value
Highly recommend
S**Z
Lead substitute and octane booster
Lead substitute and octane booster in one product, for old engines without hard valve seats in the heads. It’s for valvetrain protection, not for mileage. Not cheap.
S**T
Teste
J’avais mie le 3/4 pas tout à fait avec 60$ d’ordinaire le reste du produit dans le vtt avec du super là y me reste le 1/4 de la bouteille…. Jais pas fini de bruler le gaz pas vue de différence
S**6
This stuff is awesome!
This product has always been a good quality fuel addictive. Does what it says on the bottle.
Trustpilot
1 month ago
4 days ago