There is a difference in the viscosity (thickness) of PAG 46, PAG 100 and PAG 150. Plus, using anything other than the specified viscosity of PAG oil in systems that require it voids the warranty from many of those compressor manufacturers.
Subsequently, question is, is ND oil 8 the same as Pag 46? DENSO uses ND-oil 8 for its R134a type refrigerant compressors, a PAG 46 oil. The new refrigerant type uses ND-oil 12, also a PAG 46 oil but with additives specifically for the R1234yf type refrigerant. It can get confusing with the number of different compressors, each with a specific DENSO oil.
Subsequently, one may also ask, whats the difference in PAG oils?
PAG oils are harsher than mineral oils, and may cause skin irritation and damage O-rings and seals. There are different viscosities of PAG oil being used by OEMs: PAG 46, which is the most popular; PAG 100, which is also common; and PAG 150, which is more rarely used.
What is air conditioning oil?
Compressor Oil Or Lubricant. Compressor oil is a necessary component in any air conditioning system that uses compressor in its compression system. They are used for lubrication, removal of heat and for sealing. Lubrication cooling is needed in reciprocating compressor as the piston compresses the refrigerant gas.