I run Yamalube 4m 10w-30 and can buy it from a bulk drum. I've always heard use an oil that is made by a company that builds engines and has to warranty them. I do have a friend that uses Amsoil in everything he owns including this f-150. The four stroke oils are sesigned for the higher RPM engines and have anti foaming agents in them.
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1975 V-20 w/1996 225 Johnson
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