The Truth about Adding Two-Stroke Oil to Diesel in Modern Common Rail Engines

It seems counter-intuitive to be utilizing 2-stroke oil in diesel on common rail, low emission vehicles. The actual premise behind adding 2-stroke does carry weight in certain instances. Vehicles equipped with Bosch, Delphi, or even Siemen’s fuel systems generally don’t need it. Therefore, your unlikely to see a significant change in engine performance or noise with the use of 2-stroke in diesel.

However, if you have a 2005-2012 Denso Common Rail equipped system; your vehicle will most likely notice significant changes.

The Theory

  You need 2-stroke premixed oil, at a ratio of 300-to-1. This equals about 3ml per litre, of mineral based, low-ash 2-stroke oil. The reason why this mixture creates a beneficial difference is quite simple. With Denso Common Rail operating systems,  nearly all failures we have seen at Bailey’s Diesel are seizure related or seizure based failures . The injector becomes sticky; it generally loses tolerance and shows symptoms such as cold knocking. The idea behind adding 2-stroke oil therefore makes a lot of sense, because we’re adding lubrication where the main failure mode is seizure related.

The other interesting thing is that when we fitted all of our injectors with DLC coated injectors; we noticed a significant difference in the engine noise and smoothness. The DLC coatings applied inside our injectors create a permanent, very hard and low friction surface. So I thought if the low friction was worth a try, we should test this 2-stroke myth, and we were surprised when it actually worked quite well.

Our Conclusion

  So the reality is if you have genuine Denso injectors or the original injectors in the car, and it’s pre-2012, then adding a little bit of 2-stroke will create a longer service life for the injector, but also make it a little quieter and smoother in its daily operation.

The general premise behind it: mineral-based, 2-stroke, low-ash and 3mil of oil per litre.

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