What is the L15BU engine?

[MacDylan]

L15BU is a naturally aspirated engine. Here are the methods for engine maintenance: 1. Regularly change the engine oil and oil filter: When oil passes through the fine holes in the oil filter, solid particles and sticky substances in the oil are stored in the filter. If the filter is clogged, the oil cannot pass through smoothly, causing the filter to expand or open the safety valve, allowing oil to bypass through the bypass valve and return contaminants to the lubrication area, accelerating engine wear and increasing internal pollution. 2. Maintain crankcase ventilation: Prevent airborne pollutants from depositing around the PCV valve and clogging it. 3. Regularly clean the crankcase: During operation, high-pressure unburned gases, acids, water, sulfur, and nitrogen oxides from the combustion chamber enter the crankcase through the gap between the piston rings and cylinder walls, mixing with metal powder from component wear to form sludge. When the amount is small, it remains suspended in the oil; when large, it precipitates out of the oil, clogging the filter screen and oil holes, making engine lubrication difficult and causing wear. Regularly maintain the radiator and engine to prevent rust in the radiator.