Just watch the oil level. Iíve heard itís not good to switch to synthetic oil once the car has higher km. The car may consume oil if you switch to synthetic.
Case and point. I know a car that as driven mostly on the highway. At around 130,000 KM, they switched to synthetic. After that, the oil level starting dropping over the 5000KM interval (no blue smoke or anythingÖ but it was consuming more oil). After switching back to regular oil, everything was fine.
I think there was someone on this board that had a similar problem.
Many mechanics donít recommend switching to synthetic after the car has higher km on it (100K+).
A good regular oil every 4000-5000 KM will go a long way.
Anyway, if youíre going to use synthetic oil, watch the oil level more closely.