How do you guys mix Gas

jimmbo

Supreme Mariner
Joined
May 24, 2004
Messages
13,446
Pouring the oil into a tank of gas, with no mixing, was one of the main Reasons that the Engine Manufacturers, developed the Oil Premixing Systems back in the mid 80s. They were tired of boaters wrecking engines, then blaming the Engine, instead of themselves
 

ahicks

Captain
Joined
Sep 16, 2013
Messages
3,957
Pouring the oil into a tank of gas, with no mixing, was one of the main Reasons that the Engine Manufacturers, developed the Oil Premixing Systems back in the mid 80s. They were tired of boaters wrecking engines, then blaming the Engine, instead of themselves
KISS!!!!!
 

dingbat

Supreme Mariner
Joined
Nov 20, 2001
Messages
16,081
Pouring the oil into a tank of gas, with no mixing, was one of the main Reasons that the Engine Manufacturers, developed the Oil Premixing Systems back in the mid 80s.
That was 40 some years ago….

Fuel and oil formulations are very different now. Synthetics, semi-synthetic and heavy solvent loads (ease of mixing and injector use) were not the norm back then. Some oil brands have now gone as far as to advertise their oil’s “self mixing” qualities
 

Grub54891

Admiral
Joined
Jun 17, 2012
Messages
6,078
I simply put the fuel in and add the correct amount of oil. Never blew one up in my 50 years of mixing.
 

airshot

Vice Admiral
Joined
Jul 22, 2008
Messages
5,085
The new oils are far better mixing than ever, but are you a gambler??? Some are, some aren't !! Being from the old days and not willing to gamble on a 5K outboard motor, I will stick with what I know works ! Some folks are very lucky or fortunate to have had sucess without trying.
 

jimmbo

Supreme Mariner
Joined
May 24, 2004
Messages
13,446
That was 40 some years ago….

Fuel and oil formulations are very different now. Synthetics, semi-synthetic and heavy solvent loads (ease of mixing and injector use) were not the norm back then. Some oil brands have now gone as far as to advertise their oil’s “self mixing” qualities
Oil is still heavier/denser than Gasoline, and the Laws of Physics still apply...
 

JimS123

Fleet Admiral
Joined
Jul 27, 2007
Messages
8,164
Oil is still heavier/denser than Gasoline, and the Laws of Physics still apply...
That's true. Today's changes show modern chemistry at its finest. The right surfactant can do wonders. And the right emulsifier can make water blend with anything.
 

briangcc

Commander
Joined
Jul 10, 2012
Messages
2,360
When I had a pre-mix 2 stroke I'd add the oil to the empty 5 gallon portable gas can. Take said gas can to local gas station and fill it up. Gas from the pump would mix the oil in. Then take gas can back to boat and top off the built in tank. Repeat as many times as needed.

That was back in my younger (lighter) years. These days I wouldn't own a pre-mix.
 

ahicks

Captain
Joined
Sep 16, 2013
Messages
3,957
When I had a pre-mix 2 stroke I'd add the oil to the empty 5 gallon portable gas can. Take said gas can to local gas station and fill it up. Gas from the pump would mix the oil in. Then take gas can back to boat and top off the built in tank. Repeat as many times as needed.

That was back in my younger (lighter) years. These days I wouldn't own a pre-mix.
These days I wouldn't own a 2 stroke!
 

airshot

Vice Admiral
Joined
Jul 22, 2008
Messages
5,085
I have to admit that my oil injected Merc has spoiled me even though mixing oil and gas never bothered me for the past 60 years, just got into the routine and never thought much about it. Now when I fill the fuel tank, I just top off the oil container. I am not ready for a four stroke either, my neighbor's son has a boat very similiar to mine, his has a 50 hp 4 stroke Honda. Mine has a 40 hp Merc two stroke and will run circles around his. That Honda is quiet, easy on fuel and runs very nice but mine is quicker, smoother idle and the extra fuel usage is minimal. The Honda is much larger and I assume much heavier. I guess time will tell, see what the future brings, just not ready to try and fix what ain't broke...
( dont know why it turned into bold lettering)
 

jimmbo

Supreme Mariner
Joined
May 24, 2004
Messages
13,446
You may change your mind after learning how to pick out the right size prop....
They lack the Torque for Acceleration that the old 2 strokes had. Maybe that is why people are now asking if 150hp is enough to pull a Skier, on a 16 ft boat...

I have probably been propping boats long before you were born
 
Last edited:

jimmbo

Supreme Mariner
Joined
May 24, 2004
Messages
13,446
I have to admit that my oil injected Merc has spoiled me even though mixing oil and gas never bothered me for the past 60 years, just got into the routine and never thought much about it. Now when I fill the fuel tank, I just top off the oil container. I am not ready for a four stroke either, my neighbor's son has a boat very similiar to mine, his has a 50 hp 4 stroke Honda. Mine has a 40 hp Merc two stroke and will run circles around his. That Honda is quiet, easy on fuel and runs very nice but mine is quicker, smoother idle and the extra fuel usage is minimal. The Honda is much larger and I assume much heavier. I guess time will tell, see what the future brings, just not ready to try and fix what ain't broke...
( dont know why it turned into bold lettering)
I bet a 20hp 2 stroke, could run circles around it.

as for the Bold Lettering. Highlight them, then Click on that 'B" above, next to the Slanted I
 

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
27,852
Gee, oil will not mix well if it concentrated in the bottom of a fuel tank. It mixes very well if the tank is mixed a few gallons at a time. So figure out how many gallons your fuel tank will take, error margin is 3 gal. Let's pretend you think the tank has 24 gallons to be filled. Divide the expected fill gasoline volume into steps. So dump a qt of oil and add 12 Gal Gasoline. If the tank looks like it can take another 12 Gal, dump a pint of oil into it.. If not, if it can take 6 gal, dump a pint of oil. After that 8 oz for 3 gal of fuel. You can get it real close to a 3 gal variance
 

ahicks

Captain
Joined
Sep 16, 2013
Messages
3,957
They lack the Torque for Acceleration that the old 2 strokes had. Maybe that is why people are now asking if 150hp is enough to pull a Skier, on a 16 ft boat...

I have probably been propping boats long before you were born
Torque: though you are certainly entitled to an opinion, my experience would be totally different....
Re: my age - I doubt that seriously sir....
 

ahicks

Captain
Joined
Sep 16, 2013
Messages
3,957
I bet a 20hp 2 stroke, could run circles around it.

as for the Bold Lettering. Highlight them, then Click on that 'B" above, next to the Slanted I
OK, so let's keep it relevant. Apples vs. apples. Show me a 2s 20hp that'll push a 20' pontoon into the mid to high teens typical of a 40-50 4 stroke......(brand not relevant) Hint, there isn't one......

Clearly you have no experience here, and you're up for a nice surprise when you "discover" the truth here....
 

jimmbo

Supreme Mariner
Joined
May 24, 2004
Messages
13,446
OK, so let's keep it relevant. Apples vs. apples. Show me a 2s 20hp that'll push a 20' pontoon into the mid to high teens typical of a 40-50 4 stroke......(brand not relevant) Hint, there isn't one......

Clearly you have no experience here, and you're up for a nice surprise when you "discover" the truth here....
Do not like 4 stroke outboards. Every one I have been on, is slow as Molasses, and A 2 stroke would have across the Lake and back before the 4 stroke got up on Plane. I used to think I/Os were slow accelerators, but they beat the 4 Stroke Outboards
 

909

Chief Petty Officer
Joined
Jul 19, 2021
Messages
537
Don't understand where this hate for 2 strokes is coming from.

They're lighter.
Have more torque and top speed.
Less moving parts.
Cheaper to buy, repair, maintain and easier to fix.

No, instead get something heavier, slower, more expensive and complicated to fix & maintain.
 
Top