What is the fuel mixture for a Mercury outboard motor?
Daniel Martin
Updated on March 22, 2026
As a general rule of thumb, add three ounces of Mercury 2 stroke premium outboard motor oil for each gallon of gas. Pour the gas and oil into a singular container. Close the gas container tightly and then shake the container vigorously to ensure that the oil and gasoline mix thoroughly.
People also ask, what is the mix ratio for outboard motors?
50:1
Subsequently, question is, what is a 50 to 1 gas oil mixture? You want to mix 2.6 ounces of oil to one gallon of gasoline for a 50:1 mixture. If you're mixing up two gallons of gasoline you will have to mix 5.2 ounces of oil to two gallons of gasoline for a 50:1 mixture.
Also question is, what is the oil ratio for a 2 stroke Mercury outboard?
50:1
What is the fuel to oil ratio for a Mercury outboard?
Valvoline 2 Stroke Outboard Oil is suitable for use in Evinrude, Mercury, Mariner, Suzuki, Volvo and Yamaha engines requiring 25:1, 50:1, 100:1, petrol/oil ratio, including those outboards with oil injection.
Related Question Answers
What is the best 2 stroke mix ratio?
32:1How do you mix fuel for a 2 stroke outboard?
Outboard Oil Ratios- 100:1 - Mix 50ml of oil per 5ltrs of fuel. Recommended by Yamaha and Suzuki for most of their small two stroke engines up to about 30hp, this ratio requires the least amount of TCW3 two stroke oil.
- 50:1 - Mix 100ml of oil per 5ltrs of fuel.
- 25:1 - Mix 200ml of oil per 5ltrs of fuel.
What is the oil to gas ratio for a 2 stroke boat motor?
50:1How much oil do I add to 5 Litres of petrol?
For a mixing ratio of 1 : 50 you need 5 litres of petrol and 0.10 litres (100cm³) of STIHL two-stroke oil.What is a 25 to 1 fuel mix?
25 :1 ratio is 25 fluid ounces of gas per 1 fluid ounce of oil. So divide the total amount of fluid ounces of gas by 25 to find the amount of oil to add. 10 gallons X 128 fluid ounces per gallon = 1280 fluid ounces. 1280 / 25 = 51.2 fluid ounces of oil to add to 10 gallons to achieve 25:1 mixture ratio. John L Simpson.How do you maintain a 2 stroke outboard motor?
There is often a small filter just above the fuel tap.- Check the spark plug. Remove the spark plug with a socket.
- Check the recoil starter. The recoil starter is held on with three bolts.
- Remove, strip and clean the carburettor.
- Remove the gearbox to check the water pump.
- Check and replace the gearbox oil.
- The Anode.
What kind of gas does a 4 stroke outboard take?
What Type of Gas Should I Use in My Boat? All current outboard, sterndrive and inboard gasoline engines are designed to operate safely on fuel with no more than 10 percent ethanol (known as E10), and under no circumstance should fuel with more than 10 percent ethanol (such as E15 or E85) be used in a marine engine.How much oil do I need for a 25 to 1 ratio?
You add one container of oil (2.6 ounces) to half a gallon of fuel to achieve 25:1 ratio.Can I use regular 2 stroke oil in my outboard?
A. No matter hold old, 2-cycle engines perform better and longer with oils specifically designed for that use. 2-cycle oils will be consumed during combustion in the piston chamber.What is the best 2 stroke oil for Mercury outboard?
Our top pick for the best two-stroke oil is the Lucas Oil Semi-Synthetic 2-Cycle Oil. It comes in a wide range of different sizes and works well in a number of different two-stroke engines. If you're looking for our best value pick, check out the Pennzoil Marine XLF 2-Cycle Oil.What is the mixture for two stroke engine?
40:1How do you tell if your outboard is a 2 stroke or 4 stroke?
Here are some easy ways to tell if your engine is two-cycle or four-cycle:- Look at the fuel cap.
- Look for stickers labeling the equipment (e.g., "Four Cycle" or "No Fuel Mixing").
- Look for an engine oil fill cap.
- The Operator's Manual will have engine fuel and oil information in it.
What kind of gas does a Mercury Optimax take?
Use the recommended 87 octane fuel. Mid-grade 89 octane is acceptable (and may provide minor performance improvements at idle). There is no reason to use High-Test fuel in this engine.What happens if you put regular gas in a 2 stroke engine?
If not, it'll overheat. Without lubrication, it'll cause high friction, causing heat and causing metal filings from the piston rings knocking around, and losing a seal. In a way, oil counteracts all of these. If it'll still turn over, flush the fuel, and put in the correct mixture of petrol and oil.Does 40 to 1 have more oil than 50 to 1?
The maximum amount of oil that meets this standard is 40:1, or 3.2 ounces of oil per gallon of gasoline. 50:1, or 50 parts gasoline to 1 part 2-cycle oil is 2.6 ounces of oil per gallon of gasoline. Superior oil is synthetic, or blended synthetic oil. There is very little difference in 50:1 and 40:1 fuel mix.What happens if you mix too much oil in a 2 stroke?
Using the proper oil-to-gas ratio is important, but if you're off, it's better to mix too much oil into your engine than mixing too little oil. Excess oil can produce a smoky exhaust, oil leaking out of the muffler, and sometimes loss of power.How do you calculate a mix ratio?
HOW TO CALCULATE PERCENTAGE IF MIX RATIO IS KNOWN. Divide 1 by the total number of parts (water + solution). For example, if your mix ratio is 8:1 or 8 parts water to 1 part solution, there are (8 + 1) or 9 parts. The mixing percentage is 11.1% (1 divided by 9).Does 10 ethanol gas hurt the engine?
Ethanol can cause several types of damage to the engine in your vehicle. Your vehicle's fuel intake components can be damaged. In addition, ethanol can cause damage to the fuel pump in your vehicle. Your engine can actually be destroyed if the ethanol content in the fuel you use is too high.How much fuel does a 60 hp outboard use?
My thoughts are a 60 hp old style two stroke will use at WOT a two stroke will use circa 6 gal/hour a four stoke will use a similar amount. At crusing speed I would expect a two stroke to use circa 4.5 gals/house (20 l/hr) a 35 % saving on this figure by a four stroke would be circa 7 l/hr.How do you check the oil on a Mercury 2 stroke outboard?
How to Check and Add Engine Oil- Before starting (cold engine) tilt outboard out/up past vertical to allow trapped oil to drain back to oil sump.
- Remove the top cowl.
- Tilt outboard to vertical operating position.
- Pull out the dipstick.
- Pull the dipstick back out again and observe the oil level.