What is non-detergent oil?

Non-detergent oil is a type of lubricating oil that does not contain any additives or detergents. It is often used in older engines, such as those found in vintage cars, motorcycles, or small engines like lawnmowers or chainsaws.

The main purpose of detergent additives in oils is to prevent the build-up of sludge, dirt, and other contaminants by keeping them suspended in the oil, allowing them to be easily removed during the oil change. However, some older engines do not have oil filters or have very basic filtration systems, making the use of detergent oil unnecessary.

Non-detergent oil typically has a lower viscosity compared to detergent oil, as it does not require the same level of protection against contaminants. It is often recommended for engines that were designed to use it or for antique vehicles with delicate seals or gaskets that could be damaged by detergent oils.

However, it is important to note that non-detergent oil may not provide the same level of protection and cleaning capabilities as detergent oil. It cannot effectively prevent the formation of sludge, carbon deposits, or varnish. Therefore, frequent oil changes may be necessary to ensure the engine runs smoothly and to avoid excessive wear or damage.

If you are unsure about which type of oil is suitable for your engine, it is always best to consult the owner's manual or seek advice from a professional mechanic.