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- Jul 22, 2020
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My A&P has just replaced the No. 1 cylinder on the Lycoming O-360-A3A on my PA-28 Cherokee 180. He says to drain the AeroShell W100 that I have just put in and replace it with a straight mineral oil. Then replace that with Aeroshell W100 after 4 to 6 hours. This is to "run-in" the new cylinder. Does anyone have a recommendation/comment on this? If you think this is a good plan what is the best mineral oil to use?