Motorcycle Maintenance and Oil Information for 2008 Hyosung GT 650 R Comet 647
Servicing the 2008 Hyosung GT 650 R Comet 647 starts with the motorcycle’s oil specification rather than a generic product recommendation. Check the model-specific guidance for choosing the lubricant and completing the refill correctly.
What kind of engine oil does a 2008 Hyosung GT 650 R Comet 647 need?
For this motorcycle, the catalog shows 10W-40, 15W-50 among its engine-oil grades. Products shown for this application include 10W-40 Synthetic Metric Motorcycle Oil, 15W-50 Synthetic Metric Motorcycle Oil. Viscosity alone does not establish full compatibility; verify the manufacturer’s oil standard.
What is the engine oil capacity for a 2008 Hyosung GT 650 R Comet 647?
The listed engine-oil capacity for this vehicle is 3.38 quarts.

