There is an old saying, “Pay me now or pay me later”. This is especially true when laying up an engine for storage. Skipping steps at lay-up will guarantee expensive repairs at start-up.

General: Each manufacturer has recommendations for oil changes, filter changes, gear case lubrication, etc. Find the manufacturers’ recommendations for your engine and follow them. Change any oils (lubricants) before storage. Any moisture in the old lubricant can cause component corrosion and pitting on bearings, which should be avoided at all costs.

Petroleum based fuels are complex compounds with many additives during the refining process – more so now as fuels are reformulated to meet government mandates to lower pollution rates. Unfortunately these same agents that make for cleaner burn make the fuel less stable. Diesel is now less than a 90-day fuel and gasoline is a 30-day fuel. After that the fuel deteriorates and loses a good portion of its efficacy. As fuel ages, asphaltenes form, darken the fuel and eventually settle to form sludge at the bottom of the tank. A good stabilizer slows down this darkening and sludge formation. Old fuel often also contains water contamination.

Storing with a Full Tank:

There is less area to support condensation, which means fewer water problems and less risk of phase separation in E-10 gasoline. There are fewer volatile fumes that can be a source of combustion, and some marine yards insist on a full tank for this reason. If the fuel does go bad, which will not happen by using K100 properly, there is more fuel to replace.

Storing with an Empty Tank:

Most often, the season starts with a fresh tank of fuel. This is recommended by some motor manufacturers However, by following this recommendation there is a much greater chance of condensation building up during the off season, which means the good, new fuel is being added to any water buildup that may exist. It is difficult, if not impossible, to drain the fuel injector/carburetor system. The remaining fuel will age, forming gums and varnishes that may result in a carburetor rebuild – expensive!

Why the Switch From MTBE to E-10?:


While MTBE has been the standard oxygenating compound in gasoline since the phase-out of tetraethyl lead, the government has determined that MTBE may get into the ground water and can cause cancer. In some areas of the country MTBE has already been replaced by a 10% ethanol (E-10) mixture. Eventually, MTBE will be phased out nationwide and replaced with E-10.


Three Main Problems When Changing From MTBE to E-10:

Commonly Used Bulk Storage Tanks

(Contamination Depth Conversion in Inches)

Basement Heating Oil Tanks

275 gallon vertical 27″x44.25″x60″

1″ = 2 gallons          2″ = 5 gallons
3″ = 9 gallons         4″ = 14 gallons

275 gallon horizontal 44.25″x27″x60″

1″ = 7 gallons          2″ = 14 gallons
3″ = 23 gallons

The mileage increase depends on your vehicle/equipment.

If your vehicle/equipment is brand new, a 2%-4% mileage improvement can be expected. New engines start out clean, and K100 keeps them clean. Mileage improvement occurs because K100 modifies the petroleum molecule, altering the burn chemistry for more complete combustion which results in more power, better mileage and a cleaner environment.

If the vehicle/equipment is older, and/or has 50,000 miles or more, and K100 has not been used, a higher initial mileage improvement of up to 12% can be expected. The first couple of tank fills using K100 can show significant results because the treatment cleans the build-up of carbon and sludge throughout the engine, as well as altering the burn chemistry. Once the system is cleaned up, additional mileage increases will not occur (you can’t keep getting a 12% improvement with each new tank).

In either case, without regular treatment, the engine will get dirty. Use K100 consistently to maintain the best mileage possible for your vehicle/equipment.

That clogged filter is proof that K100 is cleaning up the entire fuel system.

In older equipment, especially equipment run in dirty or dusty conditions, there may be dirt particles trapped in the gums and varnishes in the tank. When K100 dissolves those gums and varnishes those hard particles like dirt and rust are released into the fuel system.

Fuel filter changes are necessary to remove the debris K100 has cleaned out of the system. Continuous use of K100 will eliminate this necessity because the treatment keeps the fuel systems clean and free of gums and varnishes.

Hot weather is more reason to use K100!

Hot weather may also bring high humidity, which may cause moisture to build up in the fuel tank.  In E-10 gasoline, enough moisture in the tank will cause phase separation, and may make the engine difficult or impossible to start and running well.

A solid year-round fuel maintenance program uses K100 in warm weather at a reduced treatment ration to stay ahead of the moisture contamination. K100 encapsulates and burns off as fuel any moisture in the tank, eliminating free water that causes phase separation in E-10 fuel.

We don’t recommend mixing fuel treatments.


Most fuel treatments are petroleum-based and are specifically designed to repel water. K100 is bio-based and specifically designed to attract water. Mixing the two together with water as a catalyst may cause unknown and undesirable reactions.

To test for compatibility of additives with water, add equal amounts of water, K100 and the other treatment to a small glass bottle. If the resulting liquid is clear, the two treatments are compatible. If it’s milky, or you see any formation of solids, the treatments are not compatible.

However – Even if compatible with water, other components in the different treatments may cause unpredictable reactions when added to fuel. It’s best practice not to mix them.

Because of it’s chemistry, K100 will always mix completely.

It doesn’t matter if K100 is added before, half-way through, after – or days after – filling the tank because K100 will always mix completely with the fuel without agitation.

Test for yourself and see the difference.


As a comparison, you may wish to repeat the tests below with the fuel treatment you are currently using. As most treatments are petroleum based, chances are your treatment will show separation and water presence in the first test, freeze in the second, burn with a dark sooty smoke in the third, and exhibit signs of rust in the fourth. We feel confident that the differences will become immediately apparent.

  • Test #1: Fill a small, clear glass bottle 1/3 with water, 2/3 with K100. Note the clear solution – K100 has completely mixed with, and encapsulated, the water molecules. It will never separate. Use water detecting paste to find no water present.
  • Test #2: Put the treated bottle into your freezer for as long as you like.
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