The recommended engine oil grade for Yamaha MT-15 is 10W-40 API service SG type or higher, JASO standard MA and has an engine oil capacity of 0.85 liter. @ Dillip | The recommended engine oil ...

This acts as a barrier against dust and moisture, keeping your bike looking sharp all winter. Old oil can contain contaminants that might harm your engine if left sitting for months. Change the ...

if you feel around 7000 or 8000 kms bike engine has more vibration or making more noise and gear shifting is change than the viscosity of oil can be the reason too. So depends upon your riding method.