I add some but did not notice any differance. However, I had left over 2 stroke oil and it gave me something to do with it. Since is is supposed to reduce the "wear scar" even if it dose nothing noticable it is a good thing.
See post #13 for cart Spicer Lubricity Test. The shorter the blue bar on the chart means less "Wear Scar".
http://www.peachparts.com/shopforum/showthread.php?t=203315&highlight=stroke+oil

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84 300D, 82 Volvo 244Gl Diesel