If your car does not reduce oil and color of the oil has not turned black, there is no need to change oil prematurely. Just change oil as per manual or if it turns black in color.
Regarding thin oil, in fact it is better for a new engine. Thinner oil will reach immediately to the internal parts for lubrication. As most synthetic oils are thinner in viscosity. So don't worry, use Suzuki genuine oil or any other, make sure it's according to the car's owner manual recommended viscosity.