2003 ST 4 Stroke 9.9/15HP Johnson outboards Service Repair Manual P/N 5005714, Page 24Get this manual
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PERIODIC MAINTENANCE SERVICE D
1.0 (1 .10.9) Oil change only 1.1 (1 .21 .0) Oil filter change
Oil pressure
kPa (kgcm ,psi)
minimum 200 (2 .0, 28) maximum 5