C-4s Refrigeration Oil, 1 Gallon

The basic purpose of refrigeration oil is to lubricate the moving parts in an air conditioning or refrigeration compressor. The refrigeration oil must function without maintenance or service at higher than usual temperatures for the life of the unit. It must also be miscible with the refrigerant while retaining its lubricant properties. Nu-Calgon mineral oils are designed to provide years of trouble-free service in refrigeration and air conditioning units. Nu-Calgon naphthenic mineral oil is available in three grades: C-3s (150 SUS), C-4s (300 SUS) and C-5s (500 SUS). There is no finer mineral refrigeration lubricant on the market today.