{"id":12231,"date":"2026-08-25T13:15:21","date_gmt":"2026-08-25T13:15:21","guid":{"rendered":"https:\/\/www.jender.es\/blog\/sin-categorizar\/what-kind-of-oil-does-an-air-compressor-use-types-viscosity-and-mistakes-to-avoid\/"},"modified":"2026-09-02T07:32:44","modified_gmt":"2026-09-02T07:32:44","slug":"what-kind-of-oil-does-an-air-compressor-use-types-viscosity-and-mistakes-to-avoid","status":"publish","type":"post","link":"https:\/\/www.jender.es\/en\/blog\/air-compressors\/what-kind-of-oil-does-an-air-compressor-use-types-viscosity-and-mistakes-to-avoid\/","title":{"rendered":"What Kind of Oil Does an Air Compressor Use: Types, Viscosity, and Mistakes to Avoid"},"content":{"rendered":"\n
An air compressor uses a lubricating oil specifically designed for compressors, without detergent additives, with a viscosity that typically ranges between ISO VG 68 and ISO VG 100 (equivalent to SAE 30 or SAE 40, depending on the operating temperature). Car engine oil should never be used: its detergents create carbon deposits that damage the compressor. However, the exact type of oil depends on the type of compressor and its application, and that\u2019s where you need to be specific. <\/p>\n\n
Choosing the right lubricant is no small matter: it\u2019s what separates a compressor that lasts for years from one that breaks down prematurely. In this guide, you\u2019ll learn what type of oil to use based on your equipment, how to interpret viscosity, and what mistakes to avoid. <\/p>\n\n
Why a compressor needs a specific type of oil<\/h2>\n\n
The oil in a compressor serves several functions at once: it lubricates moving parts (pistons or rotors), seals internal spaces to prevent pressure from escaping, cools the unit by dissipating heat generated during compression, and protects against corrosion and oxidation. In a screw compressor, moreover, the oil is in direct contact with the air at temperatures exceeding 90 \u00b0C, so it must withstand those conditions without degrading. <\/p>\n\n
That is why compressor oils are formulated without detergents and have low ash and sulfur content\u2014exactly the opposite of automotive oil. An unsuitable lubricant not only performs worse\u2014it can also drastically shorten the equipment\u2019s service life. <\/p>\n\n
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Types of Oil for Air Compressors<\/h2>\n\n
There are three main categories, and the choice depends primarily on how often you’ll use it.<\/p>\n\n
Mineral oil.<\/strong> Derived from refined petroleum, it is the most economical option and sufficient for small compressors or those used in the home and for occasional use. It requires more frequent changes. <\/p>\n\n
Synthetic oil.<\/strong> Formulated in a laboratory, it offers greater thermal stability, longer life, and better performance in cold conditions and during continuous operation. It is recommended for industrial and professional use, as well as for screw compressors that operate for many hours at a time. <\/p>\n\n
Semi-synthetic oil.<\/strong> A middle ground between the two previous options, for demanding applications that do not reach the purely industrial level.<\/p>\n\n
There is also food-grade oil<\/strong>, which is required when compressed air comes into contact with food, as well as specific oils for particular applications. If your process involves such applications, the choice of lubricant is a key factor in meeting the required air quality standards. <\/p>\n\n
Viscosity: ISO VG and SAE Explained<\/h2>\n\n
Viscosity indicates how \u201cthick\u201d the oil is and is the most important factor when choosing it. It is expressed in two equivalent ways: the ISO VG scale (commonly used in industry) and the SAE scale (more widely known in the automotive industry). For compressors, the most common grades are ISO VG 68 and ISO VG 100, which correspond approximately to SAE 30 and SAE 40. <\/p>\n\n
ISO VG Viscosity<\/th>
SAE Equivalent<\/th>
Recommended Use<\/th><\/tr><\/thead>
ISO VG 32<\/td>
SAE 10<\/td>
Very cold environments or starting at low temperatures<\/td><\/tr>
ISO VG 46\u201368<\/td>
SAE 20-30<\/td>
Screw compressors (recommended standard value)<\/td><\/tr>
ISO VG 68\u2013100<\/td>
SAE 30-40<\/td>
Piston Compressors and Hot Environments<\/td><\/tr><\/tbody><\/table><\/figure>\n\n
As a general rule, a higher viscosity is recommended at higher ambient temperatures, and a lower viscosity at lower temperatures. In any case, the manufacturer’s manual for your equipment is always the definitive guide. <\/p>\n\n
What kind of oil does a piston compressor use?<\/h2>\n\n
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