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Old 12-06-2009, 05:53 AM   #1 (permalink)
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2 Stroke Oil + Diesel, not so good

As a small engine mech i use to work in a lawn mower shop. Working on everything from chainsaws to garden tractors. Working on 2 stroke engines (especially the old 2 stroke lawn boy push mowers) i noticed alot of gum build up around the exhuast ports and exhuast related components. Like every 2 stroke you will notice gum build up in the exhuast components. this is why they call 2 stokes "Dirtier" engines is becuase they are dirty. The reason 2 stroke engines use the mixture of gas and oil as fuel is to lubricate the engine. They don't have oil filled crank cases becuase due to the porting of the cylinder the carb is ussually mounted ON the crank case. Having the crank case filled with oil it would interfere with the fuel getting sucked up from the carb to the cylinder. Most 2 stroke don't have head valves somewhat becuase of the gum build up caused by 2 stroke oil. Thats somewhat why they have ports in the cylinder is to iliminate moving valves. I thought i'd bring up this topic for the guys that think 2 stroke oil mixed in with thier diesel fuel would improve lubrication in thier injector systems in their diesel engines. using 2 stroke oil in diesels would form gum deposits on exhuast components such as valves, manifold walls, and even turbo impeller fins. Maybe resulting in higher EGT's and sticky valves? It might work well for the injector components but it probably aint so good for the exhuast components. Show me a used chainsaw engine that doesn't have greasy gum deposits around the exhuast ports or in the mufflor. Now to the amount of gum deposits it would produce in a diesel engine i don't if it would matter so much. You could maybe use a cleaner such as injector cleaner to solve this gumming issue but i don't think it would do much cleaning effect on the exhuast components after it was burnt in the cylinder. If you want to use a fuel additive to replace the lost lubricants in todays ULSD i would just use a diesel injector lubricant. Something that was designed for lubricating injection systems in diesel engines. I wouldn't want to worry about what 2 stroke oil does to my exhuast components. it's like dumping a bottle of orange crush in someone's fuel tank. A good way to put thier car out of commision. Just my 2 sense. I'm open for dispute.
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Last edited by ChrBro; 12-06-2009 at 06:06 AM.
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Old 12-06-2009, 09:22 AM   #2 (permalink)
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Ive been runnin 2stroke oil in mine and just took the engine apart and it was clean as could be. including turbos and valves
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Old 12-06-2009, 09:29 AM   #3 (permalink)
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Old 12-06-2009, 09:32 AM   #4 (permalink)
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Quote:
Originally Posted by ChrBro View Post
As a small engine mech i use to work in a lawn mower shop. Working on everything from chainsaws to garden tractors. Working on 2 stroke engines (especially the old 2 stroke lawn boy push mowers) i noticed alot of gum build up around the exhuast ports and exhuast related components. Like every 2 stroke you will notice gum build up in the exhuast components. this is why they call 2 stokes "Dirtier" engines is becuase they are dirty. The reason 2 stroke engines use the mixture of gas and oil as fuel is to lubricate the engine. They don't have oil filled crank cases becuase due to the porting of the cylinder the carb is ussually mounted ON the crank case. Having the crank case filled with oil it would interfere with the fuel getting sucked up from the carb to the cylinder. Most 2 stroke don't have head valves somewhat becuase of the gum build up caused by 2 stroke oil. Thats somewhat why they have ports in the cylinder is to iliminate moving valves. I thought i'd bring up this topic for the guys that think 2 stroke oil mixed in with thier diesel fuel would improve lubrication in thier injector systems in their diesel engines. using 2 stroke oil in diesels would form gum deposits on exhuast components such as valves, manifold walls, and even turbo impeller fins. Maybe resulting in higher EGT's and sticky valves? It might work well for the injector components but it probably aint so good for the exhuast components. Show me a used chainsaw engine that doesn't have greasy gum deposits around the exhuast ports or in the mufflor. Now to the amount of gum deposits it would produce in a diesel engine i don't if it would matter so much. You could maybe use a cleaner such as injector cleaner to solve this gumming issue but i don't think it would do much cleaning effect on the exhuast components after it was burnt in the cylinder. If you want to use a fuel additive to replace the lost lubricants in todays ULSD i would just use a diesel injector lubricant. Something that was designed for lubricating injection systems in diesel engines. I wouldn't want to worry about what 2 stroke oil does to my exhuast components. it's like dumping a bottle of orange crush in someone's fuel tank. A good way to put thier car out of commision. Just my 2 sense. I'm open for dispute.
you also have to take into account that we mix the 2-cycle a lot less than the chainsaws. I put 8oz to 10 oz of 2 cycle into 35 gallons of fuel.and also since diesel fuel has a higher btu value wouldn't than help burn off the oil prior to the ex valves opening???
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Old 12-06-2009, 09:46 AM   #5 (permalink)
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Rather than buy diesel additives, I've been buying Sunoco Gold Diesel to get the extra lubricity in the ULSD. It's 2/L more than their regular diesel so a 100L fill-up would cost $2.00 more.

As for the 2-stroke oil, I think the consensus is to use ashless outboard motor oil (API TC-W3). See "Which Oil Is Right For You?" in Esso 2-Stroke Oil.

Last edited by fraso; 12-17-2009 at 10:34 AM.
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Old 12-06-2009, 11:45 AM   #6 (permalink)
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The reason you saw the gummed up small engines is because people overdose 2 stroke engines all the time. Also we're talking a very small ratio of 2 stroke oil. (A quart to 34 gallons) Third, the cyl temps and pressures are WAY different.

I've been running two stroke. I've had my exhaust manifold and turbo off several times. No gumming here. I'll keep running it.
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Old 12-06-2009, 11:55 AM   #7 (permalink)
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Old 12-06-2009, 12:02 PM   #8 (permalink)
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just wait till mike gets here
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Old 12-06-2009, 12:09 PM   #9 (permalink)
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just wait till mike gets here
That was my first thought also.
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Old 12-06-2009, 12:25 PM   #10 (permalink)
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just wait till mike gets here
Mike will have fun with this one !!!!

I use 2 stroke oil also. No problems or signs of gumming any where !!
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Old 12-06-2009, 01:03 PM   #11 (permalink)
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i use it off and on, no complaints, quieter engine, better mpg, i havent used it in a while because i use Lucas add. i heard a guy say one time to use a regular additive every other couple fill ups rather than 2 stroke just to clean everything out good,
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Old 12-06-2009, 01:19 PM   #12 (permalink)
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Not to worry here, there is no need for that stuff in my fuel system!
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