* 20W-20: This was more common in warmer climates.
* 10W-30: This is a good all-around choice for most climates and driving conditions. It offers better cold-weather starting than 20W-20.
However, considering the age of the engine, many people opt for a higher viscosity, such as 10W-40 or even 20W-50, particularly in warmer climates or for high-performance driving. A heavier weight oil can provide better protection for worn engine components.
Before making a decision, consider these factors:
* Your climate: Hot climates benefit from heavier oils, while colder climates might require lighter oils for easier starting.
* Your driving style: If you frequently drive at high speeds or under heavy loads, a heavier weight oil is recommended.
* Engine condition: A well-maintained engine might tolerate lighter oil, while an older engine with wear might benefit from a heavier oil to compensate for increased clearances.
* Your owner's manual: If you have the original owner's manual, it will likely specify the recommended oil weight.
Ultimately, the best way to determine the correct oil weight is to consult a trusted mechanic familiar with classic Mustangs or research your specific engine's needs based on any modifications made to it. Using the wrong oil weight can lead to engine damage.
