Question about 2 stroke oil measuring

S

steplift20

God
I have a measuring cup for2 stroke oil. On the 5 gallon mark it’s 11.6 ounces for 5 gallons.
But at 2.6 ounces per gallon it should be 13 ounces on my digital scale. So what’s right?
At 13 ounces it shows o. The measuring cup 5.5 gallons. I have been using the cups measure
 
Step, I copied your exact post/wording into google and got this which is an AI response:

Your measuring cup is incorrect for a standard mix, as it is actually calibrated for a different ratio (such as a 40:1 mix). The digital scale provides the most accurate and reliable method to ensure your engine receives the precise lubrication it needs. [1, 2]
Follow these details to calculate and mix your oil safely:
    • The Standard Math: One US gallon contains \(128\text{ fluid ounces}\). For a standard 50:1 mix (which uses \(2.6\text{ ounces}\) per gallon), 5 gallons of gas requires exactly \(12.8\text{ ounces}\) of oil (\(128 \div 50 \times 5 = 12.8\)).
    • The "11.6 Ounces" Calculation: If you mix \(11.6\text{ ounces}\) of oil into \(5\text{ gallons}\) of gas, your ratio is actually around 55:1.
    • The Scale at 13 Ounces: If your scale shows \(13\text{ ounces}\), this yields an extremely close to standard 50:1 ratio for \(5\text{ gallons}\) of fuel. [1, 2, 3]
What to do:
Because under-oiling a two-stroke engine can cause severe engine damage, you should ignore the ratio markings on your measuring cup. Instead, use your digital scale to weigh the oil directly, and pour it into your fuel container. [1, 2, 3]
Check your specific equipment's owner manual, as some older or high-RPM tools require a 40:1 mixture, which uses \(3.2\text{ ounces}\) of oil per gallon. Use the 2-Stroke Oil Mix Calculator or the 2-Cycle Oil Mix Calculator from Gold Eagle
 
steplift20 said:
What’s Gold eagle? And what you’re saying is the measuring cup is wrong? I should go by my digital scale 12.8 ozs
Click to expand...
No idea what Gold eagle is, I assume the source from which the information was gathered by AI. They way I read it, it says perhaps your measuring cup is not for a 50:1 ratio and states that your digital scale is more accurate.

But please don't take my word for it!!!!! I haven't mixed oil in anything more than 2 gallon container in the last 20 + years. And I'm probably doing that wrong too!
 
That’s what I was using. 13 ozs for five gallons.
But with the measuring cup. To the 50-1 mark for five gallons is 11.6 ounces iti zeroed out 5he container and added oil to the mark. 11.6 ozs on 5he measuring container when I put in 13 ozs it read 5.5 gallons.
 
Yeah. Dont use a digital scale.
But I have a ratio rite cup and that is saying around 20 oz for 5 gallons. And a different brand cup from bass pro and that says about 20 oz. For 32 to 1
 
Ok this is what I did. I have a cup for oil to measure the amount for a weed wacker . It has a line 2,6 for one gallon. So what’s right I did. I filled it to the mark on the bottle that said 2.6. I poured it into a cup that I zeroed out so I got the true weight. It read 2.3. Ok. 2.3 X 5 is 11.5. So what’s right I is it? 13 oz or 11.5 oz and that’s what mu measuring cup indicates.
I’m so confused. 🤔. On my scale. Should I go by the markings on the bottle that said 11.5. Or go by 13 oz ?
2.6 x5. 13 oz. Or the bottle that’s marked and comes up with. 11.5 oz. ?
What’s the difference between fluid oz and regular oz. To me a oz is a oz
O step, why did you say. Don’t use a digital scale?
 
Agree Oteps, but what Step is saying he weighed 2.6 oz on the digital scale and multiplied that by 5 to get weight for 5 gallons....at least that is what I think he is saying right Step?
 
Oil is lighter than water, that’s why it floats on the surface. But yet you can have an oz of each.

If you want to put anywhere between 11.5-13 a gallon that’s fine won’t make any difference.

The only time you need 50 to1 is WOT.

You probably leave an oz in the container anyway
 
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Ok I finally got the answer. You guys were a big help but if I don’t understand why it’s not 13 oz than I can’t get it BUT I do get it now. Yhe answer is 11.5 ounces fluid ounces not weight. So I was tight and the container is right honestly I don’t get it 100 percent but I’m good with it
 
Maybe this will help:
To easily grasp the difference between fluid ounces (volume) and standard ounces (weight), view this guide on Understanding Fluid Ounces vs Ounces. For water, 1 fluid ounce takes up exactly the same amount of space as 1 ounce of weight, whereas other liquids and solids differ. [1, 2, 3, 4]
The Core Difference

    • Fluid Ounces (fl oz) measure volume—the amount of 3-dimensional space a liquid takes up (e.g., filling a measuring cup).
    • Ounces (oz) measure weight—how heavy an item is on a scale. [1, 2]
Graphic Depiction of Water
Because water has a specific density, 1 fl oz of water is approximately equal to 1 oz of water by weight. Visualize this equivalence with these common, everyday comparisons: [1, 2, 3]
[TR]
[th]Volume (Fluid Ounces)[/th][th]Equivalent Weight (Ounces)[/th][th]Everyday Visual Reference[/th]
[/TR]
[TR]
[td]1 fl oz of water[/td][td]1 oz of water[/td][td]About the size of a standard shot glass 🥃[/td]
[/TR]
[TR]
[td]8 fl oz of water[/td][td]8 oz (or 0.5 lb)[/td][td]A standard coffee mug or 1 cup of water[/td]
[/TR]
[TR]
[td]16 fl oz of water[/td][td]16 oz (1 lb)[/td][td]A standard plastic water bottle or a pint glass[/td]
[/TR]
Why It Matters for Other Liquids
While water's volume and weight correlate almost perfectly, this does not apply to other substances. Different liquids have different densities (e.g., olive oil or honey) and will weigh more or less than their volume measurement indicates. Learn more about the Difference Between Fluid Ounces and Ounces. [1, 2, 3, 4]
 
Skycooper Now I’m really confused but as long as it’s right for my engine I’m good. But what I don’t get is. I have 2 stroke oil for my echo trimmer that has a measuring cup on the top that reads. 2.6 with a line to mark it per gallon. So what I did so I can convince myself is I filled itto the line 2.6 and poured it into a cup ( that I zeroed out) and weighted it. It read 2.3. So. 2.3 times five gallons is 11.5 ounces. And AI explained that the correct weight is 11.5 for five gallons. It also gave me the gram weight. I think it’s 326 grams but don’t hold me to the gram weight cause I wrote it-down but I’m to lazy to go downstairs to check
The gram weight is more accurate but I don’t think it will matter if you over or below a little. Who knows how accurate the gas pump is.
 
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