You cannot determine the correct oil based solely on the engine (305). The differential is a separate unit.
Here's why you need more information:
* Differential Type: Is it a standard open differential, a limited-slip differential (LSD), or a locking differential? Each type requires a different type of oil, often with different additives. LSDs, for example, typically need a special gear oil formulated for their operation.
* Viscosity: The recommended viscosity will be indicated by a SAE number (e.g., 75W-90, 80W-90, 75W-140). This number indicates the oil's performance at different temperatures. Using the wrong viscosity can lead to poor performance and damage.
* Year and Model: The specifications can vary slightly between model years and even different trim levels of the same year.
To find the correct oil:
1. Consult your owner's manual: This is the best source of information.
2. Check a repair manual: A Haynes or Chilton manual for your specific vehicle will provide detailed specifications.
3. Look at the differential tag: The differential may have a tag on it indicating the type and recommended oil.
4. Consult a parts store: Provide them with your vehicle's year, make, model, and any other identifying information (like the axle code if available).
Never guess the oil type. Using the incorrect oil can severely damage your differential.
