Here's a more nuanced answer:
* Owner's Manual: The best place to start is your 1978 Camaro's owner's manual. It will specify the recommended oil viscosity and type (straight weight, multi-grade, etc.) for your specific engine.
* Climate: The climate where you live affects your choice. 20W-50 is thicker and better suited for hot climates, providing better protection against high temperatures. 10W-30 is thinner and better for cold climates, ensuring easier starting. If you experience extreme temperatures, you might need to adjust accordingly.
* Engine Condition: If your engine is worn, a slightly thicker oil (like 20W-50) might help compensate for wear. However, if it's in good condition, a 10W-30 might suffice.
* Oil Type: For a classic car like this, a high-quality conventional oil is generally recommended. Modern synthetic oils are certainly an option and offer some benefits, but might not be necessary. Check your owner's manual to see if it specifies an API service rating.
* Break-in: If the engine has recently been rebuilt, follow the break-in oil recommendations given by the rebuilder.
In summary: While 20W-50 or 10W-30 are good starting points, always consult your owner's manual for the most accurate and up-to-date recommendation. Ignoring this advice could potentially lead to engine damage.
