The Best Gas and Oil for Troy-Bilt String Trimmers (2-Cycle & 4 Cycle)

Two-cycle engines are standard on Troy-Bilt string trimmers. Although, Troy-Bilt has also released models powered by 4-cycle engines.

You may avoid engine damage and other fuel-related problems by learning about the engine type of your Troy-Bilt and using the appropriate fuel.

2-cycle engines like those used in Troy-Bilt string trimmers need a fuel combination of 40 parts gas to 1 part oil:

  • It is recommended that you use unleaded gasoline with an octane rating of 89 or above and no more than 10% ethanol.
  • You should use high-quality 2-cycle engine oil.
  • Before putting gas and oil into the fuel tank, mix them together.

Separate fill ports can be found in Troy-Bilt 4-cycle string trimmers:

  • There is just one fueling slot for regular unleaded gas (with an octane value of 89 or above and no more than 10% ethanol).
  • There is just one SAE 30 oil filler on your engine.

It is recommended that you consult the owner’s manual for your Troy-Bilt string trimmer if you are unsure as to what kind of engine it has. Never refuel in a closed garage or near flammable materials.

troy bilt gas tank

A Troy-Bilt String Trimmer with Old or Bad Gas

The correct fuel must be used, and it must be used up promptly. Problems with starting and maintaining power on a Troy-Bilt string trimmer are typically attributable to a lack of gas.

For one thing, gas loses some of its effectiveness after only 30 days after purchase due to chemical breakdown. Ethanol, which is present in nearly all gasoline, is a moisture magnet.

After water and ethanol have separated from gas, varnish and deposits have been left behind, which cause corrosion and fuel limits in the fuel system.

Never use gas with an ethanol percentage higher than 10% due to the damage it can do.

Fuel stabilizers and new fuel should be used.

Due to its short shelf life, gas should be purchased fresh and used up within 30 days. Use a fuel stabilizer like Sea Foam Motor Treatment to keep your gas fresher for longer.

Some 2-cycle engine oils include a fuel stabilizer already built in. Unless otherwise mentioned by the manufacturer, you shouldn’t count on it to keep your gasoline steady for more than 30 days.

A gasoline stabilizer will not fix a fuel tank full of old gas. Stabilize new gasoline with additives.

Using Ethanol-Free Fuel in Your Troy-Bilt String Trimmer:

You may want to use a fuel that doesn’t contain ethanol to protect your Troy-Bilt engine. These fuels are widely available, both online and in hardware stores.

The gasoline and oil for TruFuel’s 2-cycle engine have already been combined at a 40:1 ratio. For a string trimmer with a four-cycle engine, Troy-Bilt offers fuel in canisters.

These fuels can be kept on hand in the event of an emergency. These are, however, the priciest fuel options for a trimmer.

Fuel & Oil for a Two-Cycle Troy-Bilt String Trimmer

Blending Gas and Oil for a Troy-Bilt String Trimmer’s Two-Cycle Engine

It is recommended that 2-cycle premium oil be added to gas before putting it into the fuel tank of any Troy-Bilt 2-cycle string trimmer. Putting regular gas into your 2-cycle string trimmer is a huge error.

Since the engine will seize up as a result, it will be rendered inoperable. The gas tank is nearly empty for this reason. The engine’s internal parts won’t be able to move smoothly without the oil that’s added to the gas as lubrication.

A string trimmer that has had straight gas added to it and then started will likely have to be thrown out and replaced. There is irreparable damage to the engine.

It is recommended that you use a 40:1 ratio of gas to oil in your Troy-Bilt 2-cycle string trimmer. This signifies that 50 parts gas and 1 part oil make up the mixture. See the accompanying chart for suggested proportions.

Use regular unleaded gas with an octane value of 89 or higher and no more than 10% ethanol to make this blend. Put in some ISO-L-EGD and JASO M345 FD approved 2-cycle premium oil.

Combining fuel and oil for a two-cycle string trimmer:

  • Refer to the table below to learn how much fuel mix to make.
  • To fill a legal gas can, remove the top. Put some unleaded gas (with an octane value of at least 89 and no more than 10% ethanol) into the tank.
  • Add the 2-cycle oil to the gas can according to the chart’s recommended ounces.
  • Put the cap back on.
  • In order to combine the fuel and oil, gently shake the container.
  • Fill up the tank on your Troy-Bilt string trimmer.

Use a high-quality 2-cycle engine oil, like that made by Briggs & Stratton or MTD. The 3.2-ounce bottles need to be diluted with 1 gal of gas.

2-Cycle Troy-Bilt Gas-to-Oil Blended

Gas to Oil Mix Ratio1 Gal Gas2 Gal Gas2.5 Gal Gas
40:13.2 oz Oil6.4 oz Oil8.0 oz Oil

Pre-Mixed, Non-Ethanol, 2-Cycle Fuel

Ethanol-free fuel mixes are recommended for use in order to lessen fuel-related issues and increase engine longevity. All you have to do is add this ethanol-free oil and fuel mixture to the fuel tank of your Troy-Bilt string trimmer and you’ll be good to go.

A 40:1 premixed can of fuel is available at most hardware stores and can also be purchased online.

Proper Fuel and Oil for a Troy-Bilt 4-Cycle String Trimmer

Filling up a Troy-Bilt 4-Cycle String Trimmer with Gas

Although 2-cycle Troy-Bilt string trimmers have been available for quite some time, 4-cycle models are now readily available. Because of the two distinct fuel and oil ports on these engines, fuel and oil are never mixed.

Unleaded gasoline having an octane value of 89 or higher and 10% ethanol content or less is recommended for use in 4-cycle Troy-Bilt string trimmers.

To prevent gasoline from deteriorating too rapidly and to lessen the accumulation of moisture and gumminess in the fuel system, a fuel stabilizer such as Sea Foam or STA-BIL should be added.

Gasoline with a minimal amount of ethanol in it is fine to use, but it’s not the ideal choice.

Use only ethanol-free fuel, which may be purchased at the pump at certain gas stations or in canisters at your local hardware shop or online.

Choosing petrol without ethanol can set you back more money. It’s more convenient to buy in canisters, and you may want to consider that option if you don’t want to deal with the potential problems that can arise from using old ethanol-based gas in a string trimmer.

Oil for a Troy-Bilt 4 Cycle String Trimmer

All 4-cycle motors have dual oil and fuel fills. The oil and gasoline for a 4-cycle motor should NOT be combined. Don’t ever put 2-cycle oil in a 4-cycle string trimmer.

To prevent the engine parts from seizing, oil must be used. If you use the wrong kind of oil or not enough of it, your string trimmer might not start and might even burn out the engine.

Air-cooled engines require SAE 30 oil, which is what Troy-Bilt suggests using.

Typical Oil Viscosity for a 4-Cycle Troy-Bilt Engine

ManufacturerEngine Oil
Troy-BiltSAE 30


Your Troy-Bilt string trimmer’s efficiency is dependent on the type of fuel you use. Corrosion and fuel limits can occur when fuel is allowed to age. If you own a Troy-Bilt string trimmer, selecting the right fuel is as easy as following these steps:

  • Always fill up with new gas.
  • Ethanol content in the gas shouldn’t exceed 10%.
  • Identifying the Troy-Bilt engine type is essential (2-cycle or 4-cycle).
  • To fuel a 2-cycle engine, combine gas and oil before adding it to the tank.
  • In a 4-stroke engine, regular gas is required.
  • You may prevent gas from deteriorating over time by adding a fuel stabilizer to it. Before putting to the gas tank, combine the additive with petrol.
  • Keep gas away from moisture and flammable materials.