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Old 08-18-2009, 09:07 PM   #1
91shelbyt
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Default 1980 CB750 F and synthetic oil

Hi there, i was wondering, if id be able to run synthetic in an 1980 CB750F or would it mess with the clutch?

thanks
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Old 08-19-2009, 04:00 AM   #2
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Avoid oils that contain "Energy Conserving" additives. On a bike that old, you may see seal-leakage due to the high detergent action of the synthetics as it washes the crud away left behind by the conventional oil.
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Old 08-19-2009, 06:16 AM   #3
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The engine seals in older vehicles are not designed for synthetic oils. Stick with petroleum oils.
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Old 08-19-2009, 08:01 AM   #4
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use 15w40 Shell Rotella T, best conventional oil you can find. As high a flash point as most synthetic and cheap too!
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Old 08-19-2009, 09:14 AM   #5
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Ditto on the 15/40 Dello diesel truck oil, it's high in zinc for cushioning those gears, and it's good for the bikes prostate too.
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