CR125 two-stroke engines require a special type of oil that is designed to lubricate the engine's internal components and prevent them from overheating. This oil is typically mixed with gasoline in a ratio of 32:1, which means that there are 32 parts gasoline for every 1 part oil.
SAE 30 or SAE 40 Engine Oil
CR125 four-stroke engines require an SAE 30 or SAE 40 engine oil. This type of oil is designed to provide the engine with the necessary lubrication to keep it running smoothly. The SAE 30 or SAE 40 engine oil should be changed every 1,500 miles or every 100 hours of operation, whichever comes first.
