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post #1 of 19 Old 04-29-2017, 08:18 PM Thread Starter
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Oil Mixture Lawn boy 50:1 ???

Is it ok to Run a Lawn boy type F 10515 at 50:1 with stihl ultra oil want to be sure its ok. I have already ran some in it but want to make sure long term its ok. My trimmer uses 50:1 so i want to make it easer to just have one can.
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post #2 of 19 Old 04-29-2017, 08:30 PM
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Re: Oil Mixture Lawn boy 50:1 ???

I wouldn't risk it. I am sure you could, but I wouldn't.You can run your trimmer on 32:1, though. If you have two mixtures, and you want to only have one gas can, I always would go with the richer mixture. Just my $.02

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post #3 of 19 Old 04-29-2017, 09:01 PM
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Re: Oil Mixture Lawn boy 50:1 ???

Many will argue that today's oils are Superior to older oils an can be used at leaner ratios. But these leaner ratios are intended to work in newer engines.
I have seen plenty of Lawnboy engines survive 40+ years with older oils and even SAE 30w when following factory recommended mix ratios. So why experiment on a proven method with your classic engine?
Maybe it will work, but maybe it will reduce your engines life. If nothing else... today's Superior oils when mixed to factory recommended mix ratios will only increase your engines life.
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post #4 of 19 Old 04-29-2017, 09:20 PM
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Re: Oil Mixture Lawn boy 50:1 ???

Oh goodness you started another oil thread. Get ready for pages and pages of opine..

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post #5 of 19 Old 04-29-2017, 09:49 PM
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Re: Oil Mixture Lawn boy 50:1 ???

I have ran stihl ultra and echo red armor at 50:1 for the past 3 years in everything except my 16:1 machines with no ill effects.

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post #6 of 19 Old 04-29-2017, 10:13 PM
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Re: Oil Mixture Lawn boy 50:1 ???

Wow!! What timing! I was reading the literature on my newly acquired Stihl trimmer and was contemplating the same question. Run 32 to 1 in everything, or have both 32 to 1 and 50 to 1 mixes laying around? I also have a 16 to 1 Lawn-boy edger that complicates matters as well. I think what I'll do is run 32 to 1 in everything and clean the old 16 to 1 Lawn-boy edger up and store it for the long term.


Last edited by Lawnboy77; 04-29-2017 at 11:12 PM.
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post #7 of 19 Old 04-29-2017, 10:26 PM
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Re: Oil Mixture Lawn boy 50:1 ???

Hi LawnBoy77, that's some nice looking equipment!

I've been "splitting the middle," so to speak on mix ratios and have been running Echo/Shindaiwa Red Armor, Quicksilver Rejuvenate / Mercury Racing 2 Stroke Engine Oil at 40:1 in all of my 2 stroke equipment (including Lawn Boy Dura Force) with no problems over the past few years. I'm hoping that the 40:1 ratio isn't too little oil for my Dura Force engines, but mixing several cans of 2 stroke gas gets confusing.

This new-ish Mercury oil is interesting -- https://www.amazon.com/Mercury-Mercr.../dp/B01726G6X4 The Mercury Racing 2 Stroke Engine Oil is supposedly the same formula as the old Quicksilver Rejuvenate, but has red dye. Also, Mercury Racing 2 Stroke Engine Oil also claims on the bottle to exceed TCW3, JASO FD, and ISO EGD. And I could be wrong, but the Mercury / Quicksilver oil seems slightly thicker than the Echo Red Armor oil.

Last edited by GoBigDog; 04-29-2017 at 10:32 PM.
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post #8 of 19 Old 04-30-2017, 12:50 AM
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Talking Re: Oil Mixture Lawn boy 50:1 ???

For every person on the forum there will be an opinion as to what brand of oil, synthetic or dino, what ratio, etc. I would agree that modern oils probably lubricate better than the oils of yester year. I can remember when I was a kid and my dad used to mix 40 weight in with the gas for the old Buttercup. I, for one, have run all my equipment, Lawnboys, Toros, Echo, Ryobi, etc, at 32:1ish using Lawnboy oil and have done so for over 30 years and have never had a piston seize or a major engine failure. I guess I'm just a Lawnboy purist at heart. I have daily mowers that are 40 years old that are still starting on 1 pull and run great so I figure why risk a failure. Actually I have been using one 8 ounce can plus 2 extra ounces to 2.2 gallons of fuel which if I figured correctly is a bit over 28:1. I think I may reduce that to an 8 ounce can plus 1 additional ounce to 2.2 gallons of fuel which would be 31.29:1. Seems like a weird formula but I like to fill my 2 1/2 gallon cans pretty full without overfilling and if I just put in an 8 ounce can to the 2.2 gallons my ratio would be 35.2:1, not quite where I would like it. Anyway, like I said, many opinions to be had here and many oil threads to be found. There is only one correct answer and that is what the manufacturer recommends. Can you deviate a bit from their recommendations? Probably can but better to err on the safe side and go a bit heavier on the oil rather than lighter. That's just my opinion however. Not trying to provoke any oil wars here. Bill

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post #9 of 19 Old 04-30-2017, 01:08 AM
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Re: Oil Mixture Lawn boy 50:1 ???

I have equipment that calls for 16 to 1, 32 to 1 and 40 to 1. I have two 2 1/2 gallon cans, one for 16 to 1 mixture and one for 32 to 1 mixture. I run 32 to 1 in the trimmer I have that calls for 40 to 1,, and the correct 32 to 1 and 16 to 1 in equipment calling for 32 to 1 and 16 to 1. Even though oils today are likely better then what was available years ago, correct mixtures depends on a lot of things, such as what type of bearings / bushings and where they are, how many rings on piston, type of bore (cast iron sleeve, chrome on aluminum or only aluminum. Another variable is the flywheel and how much air it is forcing across the cylinder. I would say if you are going to run a different ratio then what is recommended , go to a ratio with more oil.
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post #10 of 19 Old 04-30-2017, 02:28 AM
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Re: Oil Mixture Lawn boy 50:1 ???

I run my 22261 at 50:1, occasionally I'll drop a little extra oil in it. Seems to be fine.

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post #11 of 19 Old 04-30-2017, 09:42 AM
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Re: Oil Mixture Lawn boy 50:1 ???

After reading the above posts, I think that I'll go back to 32:1, at least for my Lawn Boy dura force mowers, and probably for everything. My Echo and Husky string trimmers have been "spooging" a little bit with the 40:1 mix ratio that I've been running. But my Echo hand held blower, Tanaka clearing saw/trimmer and Mantis tiller all run fine at 32:1. The opinions expressed above, of erring on the safe side make sense to me, so I'll try going back to 32:1.
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post #12 of 19 Old 04-30-2017, 11:59 AM
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Re: Oil Mixture Lawn boy 50:1 ???

I run all my 2 strokes at 40:1. That includes my stihl kombi, my stihl blower, stihl chainsaw and my late model Lawnboys, my early model Lawnboys on the other hand get 20:1 I just don't want to risk damaging my vintage Lawnboys (50's to mid 60's). I also only use premium gas with stihl 2 stroke oil and alway mix in sea foam in every gas can I do my mixing in. Never had any issues whatsoever.


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post #13 of 19 Old 04-30-2017, 01:18 PM
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Re: Oil Mixture Lawn boy 50:1 ???

I have 4 different 2 stroke mixtures. Honda HP2 @ 32-1 for my dirt bike, Lawn Boy oil @ 32-1 for my Lawn Boys, Stihl synthetic @ 40-1 for my chainsaws and weedeater. I also have a few cans of the stihl cans @ 50-1 for my Stihl weedeater.

The 50-1 makes me nervous even though its what is recommended for my Stihl weedeater. I think most of these lean mix ratios is just to make the EPA and liberals happy. There is no way 50-1 lubricates as good as 32-1. I would bet it shortens the life of the motor but not by a huge amount. For most people it takes decades to wear out an engine if the engine doesn't outlive them so when people claim they run whatever oil at 50-1 or 100-1 or whatever with "no problems" you have to ask for how long and how much do they use their equipment. I doubt they have been doing it for 40+ years. The EPA doesn't care if they cut the life of your 2 stroke engine in half and the manufacture doesn't care as long as it makes it past warranty. Heck the EPA doesn't care if your 2 stroke motor doesn't last for 1 hour.

I personally never run leaner than what the manufacture recommends. I also have a separate gas can for each ratio and you can use a permanent marker to write the oil and mix ratio on the gas can to avoid confusion.

My thing with these Lawn Boys 2 cycles is they don't make them anymore and they don't make new cylinders and as far as for the F series they don't make over size pistons so you cant even bore the cylinder. Why risk damaging a classic engine that cant be replaced? I mean once these motors are gone they are gone.

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post #14 of 19 Old 04-30-2017, 03:21 PM
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Re: Oil Mixture Lawn boy 50:1 ???

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Originally Posted by javjacob View Post
I have 4 different 2 stroke mixtures. Honda HP2 @ 32-1 for my dirt bike, Lawn Boy oil @ 32-1 for my Lawn Boys, Stihl synthetic @ 40-1 for my chainsaws and weedeater. I also have a few cans of the stihl cans @ 50-1 for my Stihl weedeater.
Well I used my new Stihl Kombi weedwacker @ 50 to 1 (Stihl Oil) for the first time this morning. That's the first time I have ever used any of my 2 stroke equipment at a leaner ratio than 32 to 1. It worked great! The only problem I had was that I couldn't smell it, with the Lawnboy oil it usually saturates my T-shirt and I smell like 2 stroke exhaust for the rest of the day. LOL The wife loves that aspect of it.

EDIT: I think I'll still go back to the old faithful LB oil at 32 to 1 though. They gave me 6 bottles of the Stihl oil so I might as well use it up.

Last edited by Lawnboy77; 04-30-2017 at 03:28 PM.
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post #15 of 19 Old 04-30-2017, 10:48 PM
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Re: Oil Mixture Lawn boy 50:1 ???

I have run the standard mix of Opti-2 across all of my equipment for the past 4-5 years or so. Now, I have not taken anything apart to see if there is any excessive wear or damage. I think the Opti-2 mix was roughly 80:1, but I usually added a tad more since it did make me nervous. As well as there generally was some added MMO in the mix. I run a single can across my F-series mowers, JD 12PB, trimmer, blower, and even in my 4-cycle Craftsman. I don't even keep a can of straight gas around for that Craftsman out of fear someone will straight gas my other equipment.

I have run out of Opti-2 and have gone back to LB oil at 32:1 for now. My plan is to run LB oil for now unless I notice my other equipment having issues. I haven't run the 12PB yet this season with the 32:1 LB mix. If it has issues, I will look into one of the synthetics again closer to 40:1 or maybe 50:1 and call it good.
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