How much oil to put in AC Compressor for 98 Izuzu trooper?

You don't add oil directly to an AC compressor. The AC compressor is a sealed unit. If it needs oil, it's because the system has been opened (e.g., for repairs or a leak). The oil is added to the entire AC system, *not* just the compressor, and the amount depends on the refrigerant charge.

You should not attempt to add oil to the AC compressor yourself unless you are a qualified AC technician. Incorrectly adding oil can damage the compressor and other parts of the system.

To properly service the AC system, you need to:

1. Find a qualified technician: Take your Isuzu Trooper to a shop specializing in automotive air conditioning.

2. Identify the refrigerant type: The technician will determine the correct refrigerant type for your vehicle (likely R134a).

3. System evacuation and recharge: They will evacuate the old refrigerant and oil, check for leaks, and recharge the system with the correct amount of refrigerant and oil. The amount of oil added will be determined by the system's capacity and the amount of refrigerant used. There is no single number of ounces that applies universally.

Trying to DIY this is risky and could lead to expensive repairs or injury. Professional service is highly recommended.