BM Auto: Art of motorcycle maintenance: DIY tips for you
For the smooth running of the engine, optimum engine oil levels must be maintained. Motorcycles have an engine oil inspection window from which you can inspect the engine oil level. If it is below the minimum level or has turned too dark or murky it is time to change the engine oil. It should also be noted that oil consumption increases during summer and reduces during winter.
Source: indiatimes.com