Honda BF135A, BF150A Outboard Motors Shop Manual., Page 92Get this manual
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BF135A-BF150A 6) Refill with the recommended engine oil to the upper limit mark on the dipstickWithout oil filter replacement: 6.5R (6.9 US qt, 5.7 Imp qt) With oil filter replacement: 6.7R (7.1 US qt