1] Hero Destini 125cc (2020) - I ride it 30 KMs daily. Has covered 6500 KMs now with two free company services, one at 800 KMs and other at 4600 KMs (changed engine oil both times). Of late I find it shuddering when accelerating from very low but not always, mechanic recommends to clean FI injector at showroom. Engine noise and NVH have increased a bit ( doesn't feel as quiet as before), Air filter (uniflow) and sponge very black, now manually cleaned by mechanic but he recommended change at every 5000 kms, Engine oil change every 2200 kms.

2] Hero Pleasure 100cc (2014) - Belongs in the family. Speedo broken / jammed at 13500 kms but it has travelled much more. Not maintained since I am seeing it for 3 years. Recently purchased ELF 20w40 engine oil and put it both in the engine and transmission. Is it ok? NVH and mild shuddering at low speed present while riding. Tyres worn out. Body rattling.

Your thoughts on best maintenance please.