* Engine RPM: Oil pressure increases with engine speed. You'll have lower pressure at idle and higher pressure at higher RPMs.
* Engine condition: Worn bearings or a failing oil pump will result in lower oil pressure.
* Oil temperature: Oil pressure is affected by oil temperature; hotter oil is generally less viscous and will produce lower pressure.
* Oil viscosity: The weight of the oil (e.g., 10W-30, 20W-50) significantly impacts pressure. Thicker oil creates higher pressure.
Instead of a specific number, look for these guidelines:
* At idle (warm engine): You should see at least 10-15 PSI. Lower than that could indicate a problem.
* At operating temperature and 2000 RPM: You should see 30-50 PSI. This is a typical range, but it can vary depending on the factors listed above.
* At higher RPMs: Pressure should increase proportionally.
Crucially: Consult your owner's manual for the specific recommendations for your *exact* year and model of 302 Mustang. The specifications might slightly differ depending on the year of manufacture and any modifications made to the engine. It will likely give you a range of acceptable pressures rather than a single number.
If you're experiencing low oil pressure, don't ignore it. Low oil pressure can lead to serious engine damage. It warrants a thorough inspection by a qualified mechanic.
