2 Stroke Fuel Compatibility ?
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URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=173945
Printed Date: 20 Aug 2025 at 9:52pm
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Topic: 2 Stroke Fuel Compatibility ?
Posted By: FREEDGUY
Subject: 2 Stroke Fuel Compatibility ?
Date Posted: 29 Aug 2020 at 6:17pm
Can a 50/1 outboard engine mix made with name-brand oil (OMC) with tw3 (whatever that is) in it be used in a chainsaw/snow blower that uses the same ratio ? The fuel is a minimum of 89 octane and "normally" Marathon brand if it makes a difference. Just seems like I've always got a gallon or two of boat fuel and run out of the other mix  . Thanks
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Replies:
Posted By: DMiller
Date Posted: 29 Aug 2020 at 6:22pm
| 50/1 is still 50/1, just lubrication oil for the 2 stroke crankcase. |
Posted By: john(MI)
Date Posted: 29 Aug 2020 at 7:14pm
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Yep! I don't understand why you wanna run 89 octane, 87 should be more than adequate! ------------- D14, D17, 5020, 612H, CASE 446 |
Posted By: FREEDGUY
Date Posted: 29 Aug 2020 at 7:28pm
John, a now-retired outboard mechanic told me to use mid-grade years ago  . I know several boaters that only run premium, I can't afford that  LOL !! Although I did see a 1/2 gallon can of premix at a local Menards for almost $30  !!I was unclear about the outboard additive in an air cooled engine is all. Thanks guys
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Posted By: Boss Man
Date Posted: 29 Aug 2020 at 8:11pm
| I was once told outboard 2 cycle is a little different than chainsaw 2 cycle but I used to mix 5 gallons of gas in the spring for the boat and finish it up in the fall/winter in the chainsaws and never had a problem. All ways used premium though to avoid any ethanol issues and a metal can. The plastic lets sunlight through which degrades the fuel faster. |
Posted By: ac45dave
Date Posted: 29 Aug 2020 at 8:44pm
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Chain saw manufacturers warn against using TW3 rated oil in a saw!!It's developed for the lower operating temps of the water cooled engines.Saws won't last long on it.The TW in the TW3 stands for two cycle water cooled.It wont take the heat of an air cooled engine on a chain saw.It's your saw, do what you want. ------------- 54 wd-45gas ; 56 wd-45d N/F w/fact p/s ; 63 d-17 sIII N/F gas ; 60 D14 N/F ; 67 d-17 sIV N/F gas ; 63D15 sII W/F; 39rc#667 ; 2021 massey 4710 fwa ; gravely 2 wheel tractors |
Posted By: Dave H
Date Posted: 30 Aug 2020 at 7:18am
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Ah the magic juice for your favorite motor. i been running 87 octane and Wally World 2 stroke oil in my Stihl for 20 years now. It ran fine a week ago. |
Posted By: IBWD MIke
Date Posted: 30 Aug 2020 at 8:01am
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I run Stihl oil in all my Stihl equipment, buy ethanol free gas too. The Stihl ooil has 'stabil' in it. Never a problem with the fuel in my saws/trimmers. That OMC TCW-3 oil is good stuff, had a bunch of it leftover from a 150 Faststrike when I traded boats, now run Mercury oil in a 135 Optimax. Used up the OMC oil in my lawnboys, at 50 to 1. Lawnboy wants you to mix 32 to 1 I think. I also think that is just a ploy to sell lots of oil!
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Posted By: john(MI)
Date Posted: 30 Aug 2020 at 9:01am
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I ran a 65 hp Mercury outboard back in the 70's - 80's. I ran generic 2 cycle oil and regular gas, 87 octane, the entire time I owned it. I think most of that time, if not all, I ran leaded gas, but it was the regular which I think was 87. I remember the oil was in a yellow rectangular plastic quart bottle. I also used it in my chainsaw. Never had a problem with it either. The oil may have been Pennzoil, but I'm not sure. It was nice having a boat that started up whenever I was ready to go out, except that darn battery terminals would corrode up and I'd have to clean them, but it had a rope start that worked fine to get it started. ------------- D14, D17, 5020, 612H, CASE 446 |
Posted By: DaveKamp
Date Posted: 31 Aug 2020 at 7:31am
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The ash forming temperature of two-stroke/watercooled is lower than two-cycle air-cooled oils. Outboards run substantially higher chamber pressures, and much lower temperatures than a chainsaw. You can run them, but reversing the two can cause problems... stuck rings, galled cylinders (particularly right at the exhaust and transfer ports), plugged up mufflers, and (when carbon flakes get in there) crankshaft bearings. I use old TC-W as bar oil instead. ------------- Ten Amendments, Ten Commandments, and one Golden Rule solve most every problem. Citrus hand-cleaner with Pumice does the rest. |
Posted By: Dakota Dave
Date Posted: 31 Aug 2020 at 9:50am
| My 1983 Mercury outboard 1974 Johnson snow mobile and 1986 Poulan have been sharing the same gas oil mixture as long as I've had them the chainsaw does get chainsaw gas when I run out. Otherwise they all get Johnson two stroke oil. My new china saw has been getting chainsaw oil but it's still running the 25/1 breaking gas. I use the cheep fuel and when it gets old pour it into a tractor and burn it. |
Posted By: Walker
Date Posted: 01 Sep 2020 at 10:52am
| Use the dino mix for a air cooled engine in a water cooled one and you will be meeting Mr. Carbon Buildup big time. |
Posted By: Ranse
Date Posted: 01 Sep 2020 at 12:09pm
| I wouldn’t recommend it. I ran a husky saw on Johnson/evinrude oil thinking two cycle is two cycle oil. I ended up with a cracked head in it after two years of use. I bought a new husky saw after that and I read in the book to never use two cycle oil designed for water cooled engines. |
Posted By: FREEDGUY
Date Posted: 01 Sep 2020 at 5:10pm
Thanks guys ! Makes some sense  .
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