Here's why:
* Older technology: The 4AF engine is a relatively old design. Engines made before the mid-1980s typically weren't designed for unleaded fuel.
* Lead's role: Lead was added to gasoline to lubricate the valve seats in older engines. Unleaded fuel lacks this lubrication.
* Engine damage: Using leaded gasoline in a 4AF engine can cause significant damage to the valve seats, leading to premature wear and tear.
Important: Always refer to your car's owner's manual for the specific fuel recommendations. However, the 4AF engine is generally designed for unleaded fuel.
