Compression Ignition Addict
Join Date: May 2011
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That study is the "Spicer" study, I think, and is 8 to 10 years old. A Google will probably find it. It's been widely quoted on Duramax, Cummins and Volkswagen diesel forums, and originated on one of them.
That study does test a variety of additives, including two-cycle ashless oil. The two-cycle oil was shown to increase lubricity in today's "dry" ultra-low-sulfur diesel. But it's important to note that the ashless two-cycle oil is actually designed for burning in an engine, and does not have such potential problems as causing deposits in the top end of the engine.
In contrast, engine oil was not designed to burn in a combustion chamber. It contains a lot of things that are good for bearings and such in the lower end of the engine, but not so good for valves, combustion chambers, etc. in the upper end where deposits can cause problems.
I keep my old unused engine oil for use in oil dispensers for door hinges and other things that can benefit from lubricants of just about any sort. I've got a supply that could last for generations the way I use it.