First get the Bike mechanism knowledge.. Engine noise is not depends on *Engine oil* ❗ It's About timely Maintenance, *Tappet epo loose aagum.nu yaaralayum solla mudiyaadhu* oil maathunaadha sound varum nu illa.. Tappet always get loosen.. if we didn't maintain the Engine head area.. Every 2 service below points have to do/✔️:- 1. Every 2 oil service, use Engine flush to remove carbon deposits on Gearboxes, Piston rings & Cylinder blocks.. it eliminates that & keep the full engine clean. (I experienced) recommend Liquimoly or Waxpol flush to use... 2. Every 2 service, adjust the tappet & check if camshaft bearings are loosed or not. If means change the camshaft lobes with full assembly. & ("If tappet nuts are worn, neenga evlo time tappet adjust pannaalum noise varum" so change tappet nuts if they weared)
