SOHC.co.uk Forums > CB750

What engine oil

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McCabe-Thiele (Ted):

--- Quote from: florence on July 08, 2026, 09:21:14 AM ---Should we not also consider the temperature of the oil and it's viscosity at start up, a critical time for the engine.  I certainly would not want 20w50 in a cold engine in the winter.  (Perhaps you don't ride in winter?)

--- End quote ---

At one time you could buy pre-oilers for many cars, a servo pumped oil giving full oil pressure before you started the engine.

Bryanj:
If you rebuild a Merc V6or8 in an HGV you have to pressurise the oil system as the pump will not self prime

Alimacdee2:

--- Quote from: florence on July 08, 2026, 09:21:14 AM ---Should we not also consider the temperature of the oil and it's viscosity at start up, a critical time for the engine.  I certainly would not want 20w50 in a cold engine in the winter.  (Perhaps you don't ride in winter?)

--- End quote ---

don’t think it’s a concern in the UK, even the North of Scotland it’s rarely that cold, I  usually drive all year round weather permitting when it’s dry, I keep bikes heated in winter to prevent condensation &oxidation forming on engine casings when temperatures drops

I’ve also previously found lower viscosity semi synth and full synthetic oils exacerbate problems with leaky cylinder head pucks, threads, and exhaust valve stems on the early cb750 on an older rebuild, and.. now that I’ve heard it, probably due to fluid dynamics and increased flow rates

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