RAM 1500 Truck 4WD V8-5.7L VIN D (2005)
Refrigerant Oil: Description and Operation
The refrigerant oil used in R-134a refrigerant systems is a synthetic-based, polyalkylene glycol (PAG), wax-free lubricant. Mineral-based R-12
refrigerant oils are not compatible with PAG oils, and should never be introduced to an R-134a refrigerant system.
There are different PAG oils available, and each contains a different additive package. Use only refrigerant oil of the same type as recommended to
service the refrigerant system (always refer to the specification tag included with the replacement A/C compressor or the underhood A/C system
specification tag).
The Sanden SD-7 A/C compressor used in this vehicle is designed to use ND-15 PAG refrigerant oil. Use only this type of refrigerant oil when servicing
the A/C compressor for the 5.9L Diesel engine.
The Denso 10S17 A/C compressor used in this vehicle is designed to use ND-8 PAG refrigerant oil. Use only this type of refrigerant oil when servicing
the A/C compressor for the 3.7L, 4.7L, 5.7L and 8.3L engines.
After performing any refrigerant recovery or recycling operation, always replenish the refrigerant system with the same amount of the recommended
refrigerant oil as was removed. Too little refrigerant oil can cause A/C compressor damage, and too much can reduce A/C system performance.
PAG refrigerant oil is more hygroscopic than mineral oil, and will absorb any moisture it comes into contact with, even moisture in the air. The PAG oil
container should always be kept tightly capped until it is ready to be used. After use, recap the oil container immediately to prevent moisture
contamination.
