2003 ST 4 Stroke 9.9/15HP Johnson outboards Service Manual, Page 12Get this manual
GENERAL INFORMATION SPECIFICATIONS Data 10R
FUEL AND OIL
Fuel Bombardier highly recommends that you use alcohol-free unleaded gasoline with minimum pump octane rating of 87 (R+M2 method) or 91 (Research method) However, blends of unleaded gasoline and alcohol with equivalent octane content may be used EvinrudeJohnson Ultra Four Stroke Oil or API classificationSESF, SG, SHSJ (Viscosity rating10W-40)
Engine oil BREAK-IN OIL (FIRST 10 HOURS) Engine oil capacity Gear oil Gearcase oil capacity
EvinrudeJohnson Four Stroke Oil (USImpqt) 1.0 (1 .1 0 .9)Oil change only 1.1 (1 .21.0)Oil filter change Ultra-HPFTM Gearcase Lubricant