1970 Johnson 115 HP Outboard Motor Service manual, Page 13Get this manual
2-6 TYPE OF GASOLINE: Use regular automotive gasolineHigher octane fuels may be used, but gen rall offer no advant ages
NOTE: When ope rating in any country other than the United Stat es or Canada, use any gasoline that will satisfactorily operate an automotive
LUBRICANT: Use eputable outboard otor oilSee inside front coverIf an outboard motor oil Is not available, good quality SAE 30 automotive oil may be usedThe oil used should have Se rvice ML-MM or Service MM mark ed on the containe Additional markingssuch as MS, DG, OM, DS designate heavy duty and should be avoidedAvo id low priced, light duty ils (containe marked only with ML designation) or multiple viscosity oils, uch as SAE lOW- 3DTYPES OF LUBRIC ANT
IMPORTANT: Additive ccmpowlds uch astune-up" compounds, "tonics ," "friction reducing" compounds, etc, are urmecessar and not ecommendedThe use of OMC engine cleaner and OMC rust preventive oil is recommendedGEARCASE