SOHC.co.uk Forums > CB750
20/50
davefirestorm:
My new to me 750F came to me with fresh oil and filter,time to change the oil again.Previous owner been running it on 20/50 mineral oil,I don’t have enough 10/40 mineral oil ( find it harder to source these days ) what are your thoughts on grades of oil to use? Apologies for bringing up the subject but it is cold and wet outside😂😂
Bryanj:
20/50 is a bit thick for uk except very high summer.
Try Tesc for their 10/40 (maybe 15/40) mineral DIESEL oil
K2-K6:
As Bryan says there's usually a match in those oils to the spec required.
Have you noticed Bryan though, the supermarkets around here have certainly reduced their oil choices availability. Asda and b+q did quite comprehensive range but all dissapeared over last few years. Huge Tesco here has absolutely minimum choice now, Eurocarparts locally still have decent choices.
From the viscosity point of view, Honda's own data states that 20w can be used from 0 degree C ambient upwards. Historically I've used 20/50 alot in these 750s and never had any issues. It's pretty low risk choice, oil condition having far more impact if not changed.
Trigger:
All oils have changed over the years. Haven't seen anyone since I was a kid lighting a fire under the tank on a truck :o
bobv7:
I always use 10/40 except for one time in an emergency when I had to put in 20/50. The engine seized a piston so I never did that again. Opie Oil have a good selection and often do club discounts.
https://www.opieoils.co.uk/c-782-10w40-motorcycle-engine-oil.aspx
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