I have been using pulsar 180 ug4 since 2011.
The bike is very solid and sticks on road pretty well.
Two of my friends hold the same machine. till now I have covered 49000 kms . And have spent around 20 to 25 thousand for service and have changed the tyres once.
The bike is pretty decent compared to its price. Mileage tend to decrease over a peroid of time. But the power output is very good if you service your machine periodically.
Bajaj oil 20w50 is very good compared to other oils. I used to give for service at vst bajaj rajajinagar and shifted to auto assembly in hanumanthnagar, where I found Mr.giridhar a very good mechanic who identifies all sort of problems told by the customer. If its maintained well it deserves it well. Overall a happy pulsar 180 customer/fanboy.