The Chrysler 300 3.5L engine's recommended oil viscosity depends on the ambient temperature and the specific year and model of your vehicle. While 10W-30 *might* be acceptable in some situations,
it's crucial to consult your owner's manual. This manual will specify the correct oil viscosity grade for your particular Chrysler 300 3.5L engine.
Using the wrong viscosity oil can lead to engine damage, reduced fuel efficiency, and increased wear. Always prioritize the manufacturer's recommendations.