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From the service manual: At 5deg C/40 deg F or higher: SAE20W40 Type SE At 15deg C/60 deg F or lower: SAE10W30 Type SE My preference: Castrol pure synthetic. You'll be amazed at how much smoother the bike shifts.

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16y ago
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Q: What viscosity oil should you use in a 1986 Yamaha 700?
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