How much engine oil is suitable for a 150cc motorcycle?

[DiBrooke]

150 motorcycles are suitable for adding one liter of engine oil, not exceeding 1.3L. The lubrication function of engine oil: Supply oil to various bearings of the unit to lubricate and cool the bearings. In the sliding bearings of turbine units, turbine oil fills between the journal and bearing bush to form a fluid lubrication film, thereby playing a lubricating role. The supply function of engine oil: Provide stable and sufficient pressure oil for the regulation system and protection devices to ensure their normal operation. Supply lubricating oil for various transmission mechanisms. According to the function of turbine oil systems, the oil system is generally divided into two parts: the lubrication oil system and the regulation (protection) oil system.

[DiLouis]

I have over three years of experience riding a 150cc motorcycle, and changing the engine oil is quite important. The oil capacity does vary between different models. For the 150cc street bike I ride, it typically takes around 0.9 liters. When changing the oil, pay special attention to the method: park the bike on level ground, let it warm up for five minutes before shutting it off—this helps drain the old oil more thoroughly. Open the drain bolt at the bottom, place a waste oil container underneath, and wait 15 minutes for it to fully drain. Then tighten the bolt, use a funnel to slowly pour in the new oil, and stop at 0.9 liters. The most crucial step is checking the oil window or dipstick—the oil level should ideally be at the midpoint. Never overfill it; last time I added an extra 50ml, and the engine sounded muffled with blue smoke. I recommend using 10W-40 full synthetic oil and changing it every 2,000 kilometers for optimal engine protection.

[StBarrett]

When I maintained my 150cc rally motorcycle myself, I found that the manual is actually the most reliable. For example, my bike clearly states 'oil capacity 1.1 liters including the filter.' Once, I didn't check the manual and directly added a whole 1-liter bottle, resulting in the oil light flashing at high speeds. Later, I realized the bike has an oil cooling system and requires a bit more oil. Now, I first replace the oil filter (buying the correct model), pour in 0.8 liters of oil, start the engine and let it run for two minutes to circulate the oil, then turn it off and wait five minutes before checking the dipstick. If it's below the middle line, I slowly top it up with 50ml increments each time for more precision. For long summer rides, I prefer using 15W-50 oil, as its higher viscosity reduces thermal degradation. For regular city riding, I save money by using mineral oil, changing it every 3,000 kilometers, which is more than sufficient.

[Velazquez]

After riding motorcycles for ten years, I've seen too many mistakes made by beginners. There's a big difference between 150cc scooters and cross bikes. My experience is that cross bikes need an extra 0.9-1.0 liters, while scooters with transmission cases only require 0.7 liters. Here's a particularly practical tip: mark milliliter increments on the oil bottle with a marker, drawing a line every 100ml. When changing the oil, stop pouring when you reach the 850ml line. After starting the engine and letting it run for three minutes, check the oil window while the engine is warm. If the oil level is below the lower limit, add 50ml, preferring to add small amounts multiple times. Using full synthetic oil is the most cost-effective, as it can last for 5000 kilometers despite being more expensive. Remember, checking the oil dipstick when the engine is cold will give a falsely high reading, so always measure when the engine is warm.