There are a lot of arguments, mostly on motoring forums, about whether or not to add 2 stroke oil to diesel powered vehicles. The main argument is that this will improve the lubricity of the fuel, particularly low sulphur(50ppm/10ppm) diesel.
Sulphur occurs naturally in oil. It is undesirable for various reasons. The main reason is that the sulphur from the exhaust pipe forms sulphuric acid in the atmosphere which results in acid rain. In the vehicle it pollutes the engine oil reducing its life. Using a low sulphur diesel reduces both the environmental pollution and the pollution of engine oil. In order to produce low sulphur diesel, the sulphur has to be removed and the process that removes the sulphur reduces the lubricity of the diesel. Diesel pumps and injectors rely on this to keep them lubricated.
In short, you shouldn't. 2 Stroke Oil is designed for 2 stroke motorcycle engines, not 4 stroke vehicles. Vehicle manufacturers and fuel refining companies all agree that running 2 Stroke Oil in fuel is likely to cause complications and there have been reports of engine failures due to 2 Stroke Oil sludging up valves and fouling injectors. As fuel refineries have produced lower sulphur diesel, so too have they added lubrication substitutes to the new diesels to the point that lubrication is now even higher than that of high sulphur diesel.
The vehicle manufacturers don't recommend putting 2 Stroke Oil in your diesel...
The fuel companies don't recommend putting 2 Stroke Oil in your diesel...
The 2 Stroke Oil manufacturers don't recommend putting 2 Stroke Oil in your diesel,
therefore it is a simple deduction that there is no reason to add 2 Stroke Oil to your diesel!
For a detailed study on adding 2-stroke oil to diesel, please see: 2-Stroke Oil In Diesel – A Technical Study. This is the most substantive, peer-reviewed study done to date that doesn't rely on anecdotal evidence.
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