Rajul,
Using that fuel will not hurt anything in the 4-strokes. You may over time experience an excessive amount of burnt castor buildup on the valves and some gumming of the ring land with a high castor content. The bottom line is that the fuel you're using does have enough lubrication and none needs to be added for most any 4-stroke on the market today.

If you have the availability in your area, an all synthetic fuel or a fuel with the majority (80% or 90%) synthetic will best suit 4-strokes as long as it has enough total oil in it to satisfy the engine manufacturers oil recomendations of your 4-stroke.
A little bit of castor in a 4-stroke fuel will help with keeping rust away without gumming anything up.

Fuelman