My recommendation would be Aeroshell 50 weight Mineral Oil until the engine is broke in. My engine change intervals on Lycomings are first oil change at 5 hours and then 25 hours thereafter. After the engine is broke in I switch to Aeroshell W100.
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Built, RV 8, RV8A, RV 10, RV12, Purchased RV7A
Restored J3Cub and PA28R180
Pecan Plantation
Eagles Nest Mentor
EAA Tech Counselor
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