It is a known fact that FS oil is more stable and fine slippery oil compared to the same grade of Mineral oil.It is one of the reason that during an engine break in time, FS is not recommended,since it will not allow the engine parts to wear and seat with each other to give good mating of parts.
Apart from machining tolerance, the choice of material also plays an important role in selection of engine oil..So an engine oil selection is the culmination of many factors best known to the designer and manufacturer...
I use Diesel oil in my Karizma-R of a specific manufacturer ,grade, and spec,after going through the MSDS of the oil . Still it was an experiment, and I must say I was lucky to get the benefits of the Additive package in the oil, and the oil suited the engine well...A few other owners of ZMA/ZMR have tried the same with very good results, and so continue to use it....
It is always good to stick to what the Designer/Manufacturer recommends , and if you want to experiment....remember " Your experiment, Your Risk".



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