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How to use AeroShell Oils W80, W100, and W120 AeroShell W Oils can be used in four-stroke (four-cycle) certified reciprocating piston engines, including fuel-injected and turbocharged engines. Radial engine operators tend to use AeroShell Oil W120 in warm weather, while AeroShell Oil W100 and AeroShell Oil W 15W-50 should be used in cooler temperatures. For Lycoming and Continental flat engines, AeroShell Oil W100 or AeroShell Oil W 15W-50 are the most common choices. But AeroShell Oil W80 works brilliantly in place of AeroShell Oil W100 during the colder months. Check with your engine manufacturer or rebuilder to find out if AeroShell Oils W80, W100, or W120 can be used during break-in. While many engine manufacturers and rebuilders and overhaul agencies say to use straight mineral oils, some say that either ashless dispersant or straight mineral oil can be used for break-in – for example, for Lycoming O-320H and O/LO360E. For all turbocharged Lycoming engines, ashless dispersant oils are recommended for break-in. AeroShell W Oils shouldn’t be used in automotive engines. If you’re using an automotive engine that’s been converted for use in an aircraft, check with the engine manufacturer to find out which oil you should use. Single Grade Ashless Dispersant Oils AeroShell Oils W80, W100, and W120 are ashless dispersant oils specifically developed for aviation piston engines. They reap the performance benefits of combining non-metallic additives with selected high viscosity index base oils. No general rule exists for every engine type when choosing the correct grade of oil; however, based on the average ambient outside temperature at engine start-up, the most common grades are SAE 40, SAE 50, and SAE 60, which equate to AeroShell Oil W80, W100, and W120 respectively.