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How critical is gas/oil mixture


Arn's Avatar
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06-07-06, 10:57 AM   #1  
How critical is gas/oil mixture

I have a can of 40:1 for my chainsaw & a can of 32:1 for my trimmer. Dear wife was helping & used the 40:1 in the trimmer. Is the mixture that critical that I should pour it out, or can I go ahead & use it? (Actually, it wasn't really dear wife, I just didn't want to sound like an idiot for not labeling the cans...)

 
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06-07-06, 01:16 PM   #2  
If the unit(s) are still under warranty I'd use only the oil/fuel mix that the MFG calls for.Any thang else will void your warranty.

But personally,when the warranty runs out,I mix my fuel at 16:1.
Thats half way between everyones brand an it's not nowhere near as confuesing.And I have never had any problems doing it this way.It's still enough oil to lub everything,and the exhoust ports/muffler doesn't clog up near as fast.

 
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06-07-06, 02:29 PM   #3  
You will get so many differing opinions on this question, that I hesitate to comment. This debate often ends in heated arguements and hurt feelings on the vintage snowmobile websites.

Using what the manufacturer requires during the warrenty period is certainly good advice. The difference between 32/1 and 40/1 is very small and should not matter. I use 40/1 in everything, including my 1962 Lawnboy that originally specified 16/1 and several other machines that recommend 32/1. I have several string trimmers I run at 40/1 regardless of manufacturer's instruction.

I feel mixing the fuel and oil properly is probably more important than the small difference in ratio you are asking about.

 
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06-07-06, 02:42 PM   #4  
I agree with the above poster and more important then the small ratio difference is the quality of the mix oil you use. I use the Stihl 2 cycle oil in both the chainsaw and the weed whip. Both run perfectly.

 
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06-07-06, 04:28 PM   #5  
I have a Johnson outboard motor that calls for 100:1 for recreational use and 50:1 for commercial use. That's a huge difference considering that it is the same engine. I've tried both ratios and they both work. More oil makes more smoke/pollutes but I would also assume that it lubricates and protects the motor more (and possibly fouls the spark plug quicker).

 
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06-07-06, 06:08 PM   #6  
Same for the difference in 50:1 and 40:1... there's not much... just a little more oil when using 40:1.

If you want to, go ahead and use 32:1 in both...... most have used synthetic 2 stroke oil's out to 100:1.... in engines that spec'd 32:1.... and the engines still run for years. I'd either use 32:1 for both, or 40:1 in both myself.


Think of it this way.... you chainsaw probablly runs lot hotter then your trimmer... and uses less oil.

Both of mine spec 40:1.... and they get synthetic 2 stroke oil mixed at 40:1 with about a ounce of marvel mystery oil...

 
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06-07-06, 06:25 PM   #7  
actually my Stihl rates 50:1 but would do fine at 40.

 
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06-08-06, 04:48 AM   #8  
I run all my 2 cycles on 50/1 As thats what I got mixed up in 3 gals. My string trimmer is a 2 cycle and have NO idea what mixture is right(the engine label is missing don't even know what brand) so I run 50/1 same with my chainsaw And a snowblower that I used to have.

 
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06-08-06, 05:22 AM   #9  
the proper ratio for sufficient protection is determined by the oil itself and not the engine. however the engine mfg knows what level of lubrication is required. we have around 40 peices of two stroke equipment from at least six different mfg's and we use one brand of 50:1 oil in all units. 16:1 is a throwback to when mix oil was not as sophisticated. then came 32:1, 40:1, and so on. as mentioned some are running 100:1 with the same or better level of lubrication. you should also tune the engine to a ratio and leave it there. as 16:1 actually pushes less gas per rpm so to speak, it requires a different carb adjustment. as you move up to 50:1, 100:1, more gas is delivered so you would lean the high speed mixture a bit. stick with one premium brand like echo, stihl, husky. never use outboard two cycle oil in an air cooled two stroke engine.

 
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06-08-06, 05:50 AM   #10  
Great info, thanks gang. My ice auger is 24:1, trimmer is 32:1 & chainsaw is 40:1. It sounds like a can of 32:1 or even 40:1 will cover everything. Thanks again.

 
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06-08-06, 03:26 PM   #11  
40/1 and 50/1 are the SAME mixture there is no differnce and to prove it heres the list of the oil bottle

The bottle says speedway 2-cycle for outboards,snowmobiles,motorcycles and power mowers cirtified SMMA TC-W3

gas to oil ratio (16:1)- 8 oz per 1 gal of gas. (24:1)- 5 oz per gal of gas. (32:1)- 4 oz per gal of gas. and (40 or 50:1)- 3 oz per gal of gas.

just so evrybody clear.


Posted By: Arn Great info, thanks gang. My ice auger is 24:1, trimmer is 32:1 & chainsaw is 40:1. It sounds like a can of 32:1 or even 40:1 will cover everything. Thanks again.

 
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06-08-06, 03:41 PM   #12  
Posted By: lexmarks567 40/1 and 50/1 are the SAME mixture there is no differnce and to prove it heres the list of the oil bottle

The bottle says speedway 2-cycle for outboards,snowmobiles,motorcycles and power mowers cirtified SMMA TC-W3

gas to oil ratio (16:1)- 8 oz per 1 gal of gas. (24:1)- 5 oz per gal of gas. (32:1)- 4 oz per gal of gas. and (40 or 50:1)- 3 oz per gal of gas.

just so evrybody clear.
50:1 is 2.56 ounces to one gallon..... where 40:1 is 3.2 ounces.

Your using this oil in air cooled engines?

 
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06-08-06, 03:53 PM   #13  
Yeah Why What kind of oil do you have that has a differnt reading then mine
Posted By: v8driver 50:1 is 2.56 ounces to one gallon..... where 40:1 is 3.2 ounces.

Your using this oil in air cooled engines?

 
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06-08-06, 08:00 PM   #14  
Ah yes, that's a multi purpose oil for air cooled and water cooled?


http://www.csgnetwork.com/oilfuelcalc.html

 
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06-08-06, 11:51 PM   #15  
yes it is for AIR cooled (for use in outboards power mowers motorcycles snowmobiles)
Posted By: v8driver Ah yes, that's a multi purpose oil for air cooled and water cooled?


http://www.csgnetwork.com/oilfuelcalc.html

 
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