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The conventional engine oil is produced during petroleum refining process, so called the mineral engine oil.
The synthetical oil is chemical proccessed conventional engine oil, some manufacturer would add some extra additives, to increase its lubrication and other positive performance.
Both kinds of oil are suitable for engine lubrication, but synthetical oil would have better performance for durability and so on. The price of synthetical oil is higher too.

1. Read manual carefully to understand all equipments, functions and notices.
2. Knowing the owner's equality via reading warranty criteria.
3. Never modify the bike to avoid damage or warranty uncovered, especially the electrical and engine system.
4. Never disassemble the bike by self.
5. Carry owner's manual onboard, in order to contact service center while breakdown.
6. Perform periodical maintenance schedule noticed by owner's manual, especially the engine oil, gear oil and air cleaner.
7. Get used to warm up the bike, also avoid to apply throttle suddenly.
8. Return to service center as soon as possible if abnormalities are found.
9. Use SYM Genuine spare parts to ensure quality and safety.

The 2 stroke engine oil would mix with fuel to lubricate the engine system, then burn with fuel together.

If the engine oil warning light glows, the engine oil should be supplied as soon as possible to prevent engine from seizing.

The 4 stroke engine oil is contained in the crank case, must be exchanged every specified mileage noticed in the manual.

The key point is to keep sufficient volume of engine oil, so the driver should recharge or exchange the engine oil if needed.

The fuel consumption rates declared by SYM are based on laboratory experiments.

The condition of those experiments are quite different from daily on-road use, which are affected by driver's weight, road condition, speed, tire pressure and driving habits.

Generally, the consumption difference gap between 20%~30% is acceptable.