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Old 05-22-2016, 02:56 PM   #1 (permalink)
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2 Stroke oil in diesel fuel = BAD

So I'm new to diesels, and sceptical on Fuel additives, but I thought I'd look in to it, seems like a lot of guys like Opti-Lube XPD, And I seen studies that show it does help in different ways, but locally (Central Alberta, Canada) It is not very easy to come across. I started looking in to "home brews" or mixing additives with 2-stroke oils. Came across this study that shows that adding 2 stroke oil in diesel fuel actually has more Cons than Pros.

have a gander at this study.

2-Stroke Oil In Diesel ? A Technical Study

Based on the results of this study, the following conclusions are drawn:

At a 200:1 volumetric blending ratio, 2-stroke oil has a negligible effect on diesel lubricity.
All diesel fuel sold in South Africa has to meet the SANS 342:2014 lubricity specification to ensure the proper protection of diesel fuel pumps and injector systems.
The low sulphur diesel products sold by Sasol contain lubricity improver additives which are far more effective than 2-stroke oil.
At a 200:1 volumetric blending ratio, 2-stroke oil has a negligible effect on diesel cetane number.
No measurable effect on all other regulated diesel properties was measured at a 200:1 dose of 2-stroke oil in diesel.
2-stroke oil can contain around 16ppm zinc, or higher depending on the formulation and batch.
Trace amounts of zinc in diesel are known to rapidly accelerate injector nozzle deposits.
Engine test results show that a 200:1 blend of 2-stroke oil in diesel results in a 2% loss of engine power in a 16 hour test due to injector fouling, a risk that would apply to any common rail diesel engine, but could also worsen fouling in older engines.
Vehicles fitted with a diesel particulate filter (DPF) in the exhaust system could experience reduced DPF life due to the collection of ash and metal based contaminants in the filter over time with the continued use of 2-stroke oil.

The abovementioned results should hopefully clear up many of the public misconceptions around the use of 2-stroke oil in diesel and highlight why both oil companies & engine manufacturers do not recommend the addition of any after-market additives, ie. 2-stroke oil, to the fuel tank. It is also good advice to use fuels from reputable outlets backed up by the technical support of a competent fuel company to enable the best engine performance and durability.

I know this test was done in south africa, and fuels there are slightly different, the results show that using 2-stroke oil did not improve anything really, so I'm assuming the same would happen in North America.

Some guys swear by additives, myself, I think i will just run some Opti-lube or Diesel keen in a couple times a year. thats it. (more worried about gelling in winter)

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Old 05-22-2016, 07:39 PM   #2 (permalink)
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Thanks for posting this. I have been using Diesel Kleen since my truck was new, and a blend of Diesel Kleen and 2-Stroke oil for about a year, based on the lubricity study in the forums. No more 2 stroke oil for me.

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Old 05-22-2016, 08:31 PM   #3 (permalink)
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The lubricity was not what caught my eye, it was the zinc that potentially plugged the injectors and how current the study is March of 2015. BUT, the TC-W3 2 stroke is for outboard fuel injected water cooled engines not carbureted engines, so which 2 stroke oil is being tested...

2-Stroke Oil In Diesel ? A Technical Study

Go to the bottom of the page for more links........

Adding 2 Stroke Oil to Diesel

TC-3W 2 stroke oil OK in diesel fuel Google search


5.3 Zinc Content

Modern diesel engines require clean diesel, which refers to diesel free of harmful contaminants such as sulphur and metals. It is well known that sulphur can poison the platinum coated catalysts and oxygen sensors, and also cause a build-up of sulphuric acid in the oil. It is of course beneficial to use the lowest sulphur that can be sourced, and any diesel engine is compatible with sulphur free diesel. It is less well known that traces of soft metals such as zinc and copper can be dissolved into diesel fuel and are known to cause stubborn injector nozzle deposits. These deposits narrow the nozzle holes of diesel fuel injectors which result in less fuel delivery and engine power loss over time. 2-stroke oil, like most engine oils, does contain zinc. In this study two different brands of 2-stroke oil, referred to here as 2SO A and 2SO B, were analysed and found to contain high levels of zinc:

  • 2SO A: 15.8ppm Zn
  • 2SO B: 16.9ppm Zn
5.5 Injector fouling

The Sasol Common Rail Injector Fouling test method is based on a worldwide industry standard test for injector fouling. The development of this test procedure and subsequent results have featured in a number of peer reviewed international publications (Velaers, 2012/2013). In this study fuels were tested without detergency additives or any artificial zinc addition. The same 4 Cylinder common rail turbo-diesel as described in Section 4 was used in this test procedure on a bench dynamometer at the Sasol Automotive Lab.

Figure 5: The engine test apparatus used at the Sasol Automotive Lab
The engine test was started with new injectors and was run over a very high load test cycle for 16 hours. Every 30 minutes the engine’s full power and associated fuel flow was measured at 4400rpm (rated power and maximum rail pressure point of the engine). Any drop in power and fuel flow over the running time of the test indicates that injector fouling is taking place, restricting fuel flow though the injector nozzle holes into the engine.
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Last edited by c20elephant; 05-22-2016 at 08:32 PM.
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Old 05-22-2016, 10:03 PM   #4 (permalink)
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Simply put, that study wouldn't preclude me from running good old Walmart TC-W3 in my truck.

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Old 05-23-2016, 06:59 AM   #5 (permalink)
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Moved to proper area.
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Old 06-21-2016, 02:01 PM   #6 (permalink)
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Every so often I dump some diesel kleen int my tank of fuel and that's about it. Not a regular or scheduled thing. I don't even think I can feel any difference. Truck just runs good all of the time. Maybe it helps keep the injectors clean. Aside from that it runs on Shell diesel fuel and the reason for shell is that it is generally the least expensive on the route I use traveling to the shooting range.
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