However, generally speaking, a 1995 Astro Van would likely use either:
* 5W-30: This is a common viscosity grade for many vehicles and likely a safe bet if you don't know the specific engine.
* 10W-30: Also a possibility, especially in warmer climates.
Crucially: Always refer to your owner's manual for the *exact* recommended oil type and viscosity, and the correct oil capacity. Using the wrong oil can damage your engine.
