Gumout question and answers.

Find below a comprehensive Q & A about all things Gumout

1. In the introduction, it was mentioned that dirty surfaces can hold moisture and cause rust. For internal panel surfaces, under-car and high wash areas, have you found that waxy or oily coatings perform better? What are Gumout’s offerings and how do they compare to the competition? Are there any concerns with rubber compatibility?

Gumout doesn’t have products for these areas you mention. However, for exterior prep we have some other brands that can do the job. Clean the surface using the appropriate cleaner for the vehicle surface, for example Black Magic® Car Wash, Black Magic® Wheel Cleaner, Black Magic® 2-in-1 Engine Shine. These products remove soils that may trap moisture and contribute to corrosion.

Step 2. To protect the surface use a quality wax containing hard natural wax such as carnauba or synthetic micronized waxes and detergent resistant silicones. This will form a barrier between the surface and moisture to help protect against rust and corrosion. Regular oils or silicone fluids will usually wash away more quickly when exposed to the weather.

Rubber compatibility is not a concern for damage, but most traditional car waxes contain polishing agents that leave a white residue on rubber, so avoid rubber.

2. Before winter do you recommend adding fuel stabilizer running for 10 mins then draining carb or leaving it full of the stabilized fuel?

We recommend a treatment of fuel stabilizer (Gumout® Multi-System Tune-Up) and leaving the fuel system full of fuel. Emptying the carb will usually leave fuel residue behind and the empty headspace will encourage evaporation and oxidation causing gum and varnish.

Sometimes your storage plans may change and you may want to take the vehicle out of hibernation or use your stored equipment. The easiest solution to this issue is always (throughout the year when it is used) treat the fuel used in seasonal equipment with stabilizer and complete fuel system cleaner. This way the system is consistently being cleaned and will be ready for storage at any time.

3. The Gumout Multi-System Tune Up claims to stabilize fuel. How long does it stabilize fuel? Would doubling the amount increase the “longevity” of the fuel?

While the exact length of time will vary depending on the specific fuel and storage conditions, on average our product will stabilize up to 12 months. Doubling the amount will increase the life of the fuel, but we cannot promise the fuel life will double.

We have run a test program that demonstrated treated fuel lasted well over double the life of untreated fuel. Another multi system additive competitor in a similar package actually reduced the life of the fuel to less than untreated in this same test. Yes, competitor-treated fuel was less stable than untreated. Visit the Multi-System Tune-Up science page on for more details.

4. Does the All-in-One also stabilize fuel? If so, would it be the same as the Multi-System Tune Up?

There are no anti-oxidants in All in One fuel therefore it will not stabilize fuel. Gumout Multi-System Tune Up will stabilize fuel and oil.

5. Do your fuel stabilizers work with E10 ethanol? I run E85 in my vehicle that is made for E85, which of your products will work with E85? Is a fuel system conditioner necessary while running E85?

Gumout® Multi-System Tune-Up will work with E0, E10 and E85. It contains a specially designed additive package that is soluble in all these types of fuel. All other Gumout® additives work in either E0 or E10, but may not dissolve properly in E85. We recommend using Gumout® Multi-System Tune-Up while running E85 to keep the fuel system clean.