The oil capacity of a 1999 Harley-Davidson Softail can vary depending on the specific model and engine type. However, a general guideline for the oil capacity is typically around 3.5 to 4 quarts (approximately 3.3 to 3.8 liters).
It's important to consult your motorcycle's owner's manual or service manual for the exact oil capacity specified by the manufacturer for your particular model and engine. These manuals provide detailed information on the correct oil capacity, oil type, and recommended maintenance procedures specific to your motorcycle.
Following the manufacturer's guidelines and using the recommended oil capacity will help ensure proper lubrication and optimal performance of your Harley Softail's engine.