1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 120Get this manual
Description CAUTION
Be careful not to get dirt or other contamination in tank, hoses or other components of the oil injection system
Hose Connections
CAUTION
Engines with oil injection must be run on fueloil ratio of 50:1 in the fuel tank, in addition to the oil supplied by the oil injection system, for the first 30 gallons of fuelRefer to break-in procedure in the Operation and Maintenance Manual