The recommended oil viscosity for a Yamaha Venture is 10W-40. This oil can be used in most climates, but it is recommended to use a heavier weight oil in hot weather.
Synthetic vs. Conventional Oil
Yamaha recommends using Synthetic Oil in the Venture. This will provide better protection for your engine and will last longer than conventional oil.
Oil Filter
When changing the oil, it is also important to change the oil filter. The oil filter helps to remove contaminants from the oil, which can damage the engine.
Oil Change Interval
Yamaha recommends changing the oil and filter on the Venture every 3,000 miles or every six months, whichever comes first.