Approved Refrigerant Oils For Refrigerant R1234YF

• Only fill the refrigerant circuit with approved refrigerant oils. Refer to the Parts Information. The correct refrigerant oil depends on the manufacturer and the type of A/C compressor installed.
• Too much refrigerant oil in the refrigerant circuit increases the pressures and reduces the cooling output of the system.
• Too little refrigerant oil in the refrigerant circuit can lead to A/C compressor failure due to lubrication problems.
• Refrigerant oil absorbs moisture. Do not use refrigerant oil from containers that have been open for a long period of time. Refer to REFRIGERANT AND REFRIGERANT OIL .

Important Information:

Refrigerant oil attracts moisture. Close any opened containers immediately after use to prevent moisture from entering.

• The specification about the usability of the refrigerant oil is given on the bottle the refrigerant oil is delivered in.
• This time specification does not need to be observed when the delivered bottle is tightly sealed.
• Refrigerant oil from a tightly sealed bottle can also be used after the time specified on the bottle.

• The refrigerant oils specified for refrigerant R134a are not suitable for refrigerant R1234yf. Refer to the Parts Information.
• The special refrigerant oil that is only used for refrigerant circuits with refrigerant R1234yf is not always commercially available. Refer to the Parts Information.
• Refrigerant oils specifically designed for each compressor can therefore be obtained from the replacement parts program. Refer to the Parts Information.
• If a faulty A/C compressor is replaced with an A/C compressor from another manufacturer, check if the same refrigerant oil is approved for the A/C compressor to be installed as the one that is already in the refrigerant circuit (from the removed A/C compressor). The refrigerant circuit must be cleaned (flushed), if the A/C compressor to be installed requires a different refrigerant oil than the refrigerant oil used for the removed A/C compressor. Refer to COMPONENTS, REPLACING .
• The use of other refrigerant oils could cause system failure, as they do not always mix and thus circulate with refrigerant R1234yf (for compressor lubrication).
• Since different refrigerant oils are used depending on the A/C compressor manufacturer, a certain small amount (up to maximum 10%) of refrigerant oil may be released in the respective vehicle refrigerant circuit with a different specification as the respective A/C compressor installed. This is so that the A/C service station does not have to be cleaned after every procedure on different vehicles. Therefore for Audi, up to a maximum of 10% SP A2 refrigerant oil may be filled on a vehicle with a "Denso" A/C compressor (with ND 12 refrigerant oil), or up to a maximum of 10% ND 12 refrigerant oil may be filled on a vehicle with a "Sanden", "Mahle" or "Visteon" A/C compressor (with SP A2 refrigerant oil). However, other refrigerant oils that are not specified here may not be filled (different properties due to different viscosity, other or missing additives, etc.).
• Instead of discharging via the A/C service station, the extracted refrigerant oil can either be filled when discharging the refrigerant circuit via an open connection before evacuating the refrigerant circuit, or at the removed valve -3- via a service connection -1 or 2- using a commercially available syringe. Refer to Working with A/C Service Station (1 Of 2) / Working with A/C Service Station (2 Of 2) . This is useful for example when a refrigerant oil is specified for a refrigerant circuit, that is normally only seldom used. Always fill with fresh refrigerant oil. Refer to the Parts Information. The allocation of the service connections -1 or 2- in the vehicle is different. Refer to OVERVIEW - REFRIGERANT LINES .
  Fig 1: Identifying Valve And Service Connection

  Courtesy of AUDI OF AMERICA, LLC