1, more oil, crankcase ventilation pipe, more oil will cause string oil, crankcase pressure, the crankcase on each oil seal is easy to be so high oil pressure leading to oil leakage. Also affect heat dissipation, crankshaft resistance is also large, thus increasing fuel consumption.

2, the pressure is too high, produced from the oil seal or ventilation pipe leakage of oil and other faults, too much oil may even into the combustion chamber, burning from the exhaust pipe formed blue smoke out, causing the illusion of burning oil.

3, when the engine internal oil injection too much, the engine internal oil flow resistance increased at the same time increased its internal gas pressure, formed a consumption of the engine output power of the reaction force, piston downward, scraping hard, will accelerate cylinder wear and power decline.

4, the oil is very easy to air tube or carburetor air vent out, the engine ventilation pipe connected to the air filter, the oil added, may go into the air filter, resulting in insufficient air intake affect the combustion, thereby affecting power and fuel consumption.

5, if the pressure is too high, may also rush into the combustion chamber, resulting in spark plug carbon deposit, motorcycle idling easy to extinguish the fire.

6. It is recommended that the upper limit of the injection amount of engine oil should be controlled within 2/3 of the reticulated area of the oil scale

7, oil add more will take it out, a simple way is to use the discarded syringe inserted with the drip with the plastic tube, the oil suction out, or from the oil drain bolt will oil, until the oil ruler line, and netizens invented to remove the detergent press head to take out more oil.