Using MAK 4T PLUS SL 20W-40 oil for your 180 cc Pulsar should generally be fine. While I don't have information specifically about this particular oil brand and model, using a 20W-40 grade oil is typically suitable for a 180 cc motorcycle engine.
It's important to note that it's generally recommended to follow the manufacturer's guidelines when selecting oil for your vehicle. The manufacturer usually specifies the recommended oil grade and specifications for optimal performance and engine longevity. If you have access to the owner's manual or manufacturer's recommendations, I would suggest checking them to see if they provide any specific guidelines regarding oil selection.
If you're unable to find the exact recommended oil or information about it, using a similar grade from a reputable brand like MAK should be acceptable as a temporary solution, especially if it's the only available option in your area. However, once you have the opportunity, it would be a good idea to switch to the recommended oil or consult with a professional mechanic to ensure that you're using the most suitable oil for your motorcycle.
Additionally, during the first servicing, the manufacturer or the service center may have specific recommendations or requirements regarding the type of oil to be used. It would be best to reach out to them and inquire about the suitable oil for the first servicing of your Pulsar.