How much car refrigerant oil needs to be put in an air conditioning system?

There's no single answer to how much refrigerant oil needs to be added to a car's AC system. The amount depends entirely on the system's capacity and the type of compressor oil used. It's not something you can determine by a simple measurement or calculation without specialized tools and knowledge.

Here's why:

* Compressor Type and Oil Type: Different compressor types (e.g., rotary, swashplate, scroll) use different types of oil with varying viscosities. The correct oil type is crucial for proper lubrication and system operation. Adding the wrong type or amount can severely damage the compressor.

* System Size: Larger vehicles often have larger AC systems requiring more oil.

* Oil already present: You shouldn't just add oil; a proper AC system repair or recharge involves evacuating the old refrigerant and oil *completely* before adding new refrigerant and the correct amount of oil. Simply adding oil to an existing system is likely to be incorrect and potentially harmful.

How to find out the correct amount:

The only reliable way to determine the correct amount of oil is to consult the vehicle's service manual or a refrigerant chart specific to the vehicle's year, make, and model. Even then, the chart might provide a range, not a precise value. Ideally, this should be done by a qualified technician with access to the necessary tools and equipment to properly evacuate, flush, and charge the system. Improper handling of refrigerant can be dangerous.