1995 Mariner Mercury Outboards Service Manual 50HP 4-Stroke, Page 6Get this manual
Specifications PERFORMANCE OUTBOARD WEIGHT
FUEL AND OIL Model 50 50 h.p(37.3 Kw) 6000 RPM 224 Ibs(102 kg) Accessory Automotive Unleaded with Minimum Pump Posted Octane Rating of 87
Electric 20 in(51 cm) FUEL TANK CAPACITY RECOMMENDED GASOLINE
ENGINE OIL CAPACITY ENGINE OIL SAE SAE FO Co 25W-40 10W-30
Either Quarts or Liters SAE 10W-30 viscosity oil is recommended for use in all temperatures SAE 25W-40 viscosity oil may be used at temperatures above 40 (4 C) Use Quicksilver 4-Cycle Marine Oil with the proper viscosity for the expected tem perature in your area (see chart) If not available, use good quality, detergent 4-cycle engine oil that's meets the American Petroleum Institute (API) service rating "CD" or "SG"The service rating designations "CD or "SG" must be on the oil container, either by itself or combined with other designations