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What is the oil capacity of AC compressor in a 1990 ford f150?

There's no single answer to the oil capacity of an AC compressor in a 1990 Ford F-150. The amount of oil required depends entirely on the specific AC compressor installed in that particular truck. Different compressors have different capacities.

To find the correct amount, you must identify the compressor's model number (usually found on a tag on the compressor itself). Then, consult a reliable parts catalog (like a Ford parts catalog, or a reputable online auto parts store) using that model number to determine the proper oil charge.

Attempting to add oil without knowing the correct amount can severely damage the compressor.