Sure you can switch to 5w30 Fully Synthetic, i was using PSO Carient, its a good oil too. 5000 KM is good for these Oil but i heard some people say you can do 10,000 km too.
@hash4u i have steermatic using 5w30 Fully Syntehtic PSO , Shall i use till 10,000 km or Change it on 5000km ?