There are many variables that determine how an aircraft engine wears. As long as you’re running an aircraft engine oil, the brand and type of oil makes very little difference in your engine’s wear patterns. This is blended from selected high viscosity index base stocks and contain a minimum quantity of. After that, it doesn’t much matter which brand of oil you select. AeroShell 100 SAE 50 (straight mineral) Aviation Oil. While we aren’t exactly sure of the reason for this procedure (some theories suggest it helps with ring seating, though it could also just be held over from the days of yore), it’s fine to follow the engine manufacturers’ recommendations. Tradition would have you using mineral oil during wear-in of a new or overhauled engine, and then changing to an AD oil after two or three oil changes. At ambient temperatures the oils act as an SAE 15W or SAE 20W oil to allow your engine to spin over more easily, but at operational temperature, the oil behaves as an SAE 50W. The only difference in the multi-grade oils is the addition of long-chain polymers (viscosity improvers) that cause them to be more viscous at higher temperatures. W100 oil is an SAE 50 oil at operating temperature, and so are 15W/50 and 20W/50. We measure the viscosity at 210☏, which is in the neighborhood of your engine oil at operating temperature at cruise. Without the additive, they are called mineral oils. These are called ashless dispersant (AD) oils. Some of them have an additive in them to aid in scavenging debris and carrying it to the filter or screen. Beyond that, it matters very little what brand of oil you’re using.Īll aircraft-use engine oils on the market today (that we know of) are mineral oils, i.e., refined, petroleum-based oils. It has more than 30 years of outstanding. To use any other type of oil is to invite premature failure of the engine due to detonation. X/C Aviation Oil was the first FAA-approved mineral oil-based, ashless dispersant, multi-viscosity aviation engine oil. When you change the oil in an air-cooled aircraft engine, the only oil you can safely use is an aircraft-use oil. There is a correct grade of oil, depending on how and where you operate your engine, but there is no correct brand. Use should be limited to climates with typical ground level engine. These oils do not contain any additives except for very small amounts of pour point depressant (which aids to improve fluidity at very low temperatures) and an anti-oxidant. They do not wear differently due to a particular brand of oil. Second choice: Aeroshell W 80 or equivalent SAE 40 ashless dispersant aircraft engine oil. AeroShell Oil 80 straight mineral oils blended from selected high viscosity index base oils.
Air-cooled aircraft engines are twitchy, heat-sensitive machines that create wide variations in wear depending on the type of aircraft they are installed on, the type of cylinders employed, how they are operated, and the environment they’re flown and stored in.
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