If water is mixing with the engine oil in your Aprilia Storm 125, it indicates a serious issue that needs to be addressed promptly. There are a few possible reasons for water contamination in the engine oil:
Coolant Leak: The most common cause of water mixing with the engine oil is a coolant leak. If the coolant passages or seals in the engine are damaged or worn, coolant can leak into the oil passages, leading to the mixing of water and oil.
Head Gasket Failure: The head gasket seals the gap between the engine block and cylinder head. If the head gasket fails, it can allow coolant to leak into the combustion chamber or oil passages, resulting in water mixing with the engine oil.
Cracked Cylinder Head or Engine Block: A cracked cylinder head or engine block can create pathways for coolant to enter the oil passages. This can occur due to overheating, improper maintenance, or mechanical stress on the engine.
Condensation: In some cases, especially during short trips or in humid conditions, condensation can form inside the engine. If the engine doesn't reach its optimal operating temperature, the moisture can mix with the oil and lead to water contamination.
Incorrect Engine Assembly: If the engine was not assembled correctly during manufacturing or maintenance, it can result in improper sealing of components, allowing water to mix with the oil.
When water mixes with the engine oil, it can lead to engine damage, reduced lubrication, and accelerated wear of engine components. It is crucial to address this issue promptly by consulting a qualified mechanic or taking the motorcycle to an authorized Aprilia service center. They will be able to diagnose the exact cause of the water contamination and carry out the necessary repairs to restore the engine's proper functioning.