2002 Nissan Sentra Owner's Manual - Page 210

AIR CONDITIONER SYSTEM REFRIGERANT AND LUBRICANT RECOMMENDATIONS The air conditioner in your NISSAN vehicle must be charged with the refrigerant HFC-134a (R-134a) and the lubricant, NISSAN A/C system oil Type R or the exact equivalents. CAUTION The use of any other refrigerant or lubricant will cause severe damage to the air conditioning system and will require the replacement of all air conditioner system components. The refrigerant HFC-134a (R-134a) in your NISSAN vehicle does not harm the earth's ozone layer. Although this refrigerant does not affect the earth's atmosphere, certain governmental regulations require the recovery and recycling of any refrigerant during automotive air conditioner system service. Your authorized NISSAN dealer has the trained technicians and equipment needed to recover and recycle your air conditioner system refrigerant. Contact your authorized NISSAN dealer when servicing your air conditioner system. Technical and consumer information 9-7