Yamaha F100B F100C Outboards Factory Service Manual, Page 67Get this manual
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Power trim and tilt unitLower unitGeneral Recommended gear oil: Hypoid gear oil SAE: 90 Oil quantity: F100B: 0.785 (0.83 US qt, 0.69 Imp qt) F100C: 0.670 (0.71 US qt, 0.59 Imp qt) 5 Install the check