However, generally speaking, for a 1998 Chevy Venture, you'll likely find that the recommendation is for a 5W-30 oil. This is a common viscosity for that era of vehicle. The manual will also specify whether to use conventional, synthetic blend, or full synthetic oil.
Before changing your oil, always confirm the correct oil type and weight in your owner's manual. Using the incorrect oil can damage your engine. If you don't have the manual, you can often find a digital copy online by searching for "1998 Chevy Venture owner's manual" (you might need to specify the engine size).
