The engine oil drain plug on the 1999 Harley Davidson FLHR is located in the bottom of the oil tank, on the left side of the motorcycle. The oil drain plug is typically a 17mm hex head bolt.
To drain the engine oil, you will need to:
1. Place an oil pan under the oil drain plug.
2. Use a wrench to loosen the oil drain plug.
3. Allow the engine oil to drain completely into the oil pan.
4. Replace the oil drain plug and tighten it securely.
It is important to note that the engine oil should be drained while the engine is warm, as this will help to drain the oil more effectively. Additionally, it is recommended that you change the oil filter at the same time as you change the engine oil.
