It is generally recommended to follow the manufacturer's guidelines and recommendations for engine oil change intervals. The Bajaj Pulsar NS150 comes with its own recommended oil change interval, which can be found in the owner's manual or by contacting a Bajaj authorized service center.
Motul and Shell are reputable brands known for producing high-quality engine oils. If you decide to switch to Motul or Shell engine oil before reaching 2000 km on your Pulsar NS150, it's important to ensure that the oil you choose meets the manufacturer's specifications for your motorcycle.
Before making any changes to your engine oil or maintenance routine, it's advisable to consult the owner's manual or seek guidance from a qualified technician or Bajaj service center. They can provide the most accurate advice based on the specific requirements and recommendations for your motorcycle model.