Motorcycle Maintenance and Oil Information for 1999 Hyosung GF 125
When preparing an oil change for the 1999 Hyosung GF 125, review the engine’s oil requirements and its recommended level-check method. The answers below identify what this catalog actually lists for the motorcycle.
What kind of engine oil does a 1999 Hyosung GF 125 need?
The listed engine-oil viscosity for this application is 10W-40. The matching oil selection includes 10W-40 Synthetic Metric Motorcycle Oil. Confirm the manufacturer’s complete oil specification before using a listed product.

