F 450 4WD Super Duty V10-6.8L VIN S (1999)
4. For the A/C condenser core, add 30 ml (1 ounce) of clean Motorcraft YN-12c refrigerant oil or equivalent meeting Ford specification
WSH-M1C231-B to the A/C condenser core or the suction accumulator/drier inlet tube.
5. Add 60 ml (2 ounces) of clean Motorcraft YN-12c refrigerant oil or equivalent meeting Ford specification WSH-M1C231-B to the suction
accumulator/drier inlet tube when performing each of these repairs:
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replacement of the A/C evaporator core orifice
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replacement of the A/C compressor pressure relief valve
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replacement of a refrigerant line
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repair of an O-ring leak repair of a charge port leak
6. Replacement of components that do not require discharge of refrigerant and resulting oil loss, such as the A/C cycling switch and the A/C pressure
transducer, do not require additional oil.