Hi guys I'm new to riding. I've got a Bolwell (Sym) VS125. Last week was my first time taking the scooter to a service. I'm not familiar with the motorcycle oil lingo. From memory the Bolwell manual recommends 20w50 engine oil. I looked at the invoice from the mechanic, they've used 10w40. Does it make a difference? I'm worried it does because I feel the engine is a bit noisier than before it was serviced. And it's a bit more dragging going up hill. I know it's recommended to change the oil every 1000km and that's like every 2 months for me. I'm thinking of learning how to change the oil. It's still under warranty but the previous owner used to change oil himself so I didn't see the difference I would make. The mechanic told me that VS125 doesn't need an oil filter change because it has one inside. I just need to clean it and pop it back in. Is this true? Any info will be helpful. Thanks in advance.