To find the correct weight, you need to consult your owner's manual. The manual will specify the recommended oil weight and viscosity (like 5W-30, 10W-40, etc.) for your specific Firebird Formula.
If you don't have the owner's manual, you can try these resources:
* Online resources: Search online for "[Your Firebird Formula year] owner's manual." Many manuals are available as PDFs.
* Pontiac enthusiast forums: Forums dedicated to Pontiac cars often have knowledgeable members who can help you determine the correct oil weight based on your engine and year.
* Your local mechanic: A qualified mechanic can advise you on the appropriate oil for your car.
Using the incorrect oil weight can damage your engine. Always check your owner's manual for the most accurate information.
