1991 Johnson/Evinrude Models "EI" 40 thru 55 Service Manual, Page 12Get this manual
Service Policy When servicing an outboard which is within its normal warranty period or covered by the OMC 1+2 Extended Protection Plan, make repairs using only genuine OMC replacement components or partsIf other than genuine OMC replacement components or parts are used, OMC may refuse subsequent warranty claims involving that engine ill genuine
I':AWHENEVER replacement parts are required, always use