Oil Types
 

I own a 95 Xt600. I am doing an oil change soon. I don't know what oil is in the engine now. I am just wondering whether there is any problems when mixing oils, e.g.

synthetic with other brand synthetics,
synthetics with mineral based oils

I am considering using a Mobil Synthetic 15W50, do u think this would be suitable?? for fairly warm environments ranging from 5-40 degrees celsius.

Thanx