SOHC.co.uk Forums > CB750

Engine oil

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Bryanj:
Big problem is that most synthetics are designed for cars and have friction inhibitors in them which don't do a wet clutch any good at all whilst bike specific synthetics cost a damn fortune.

If you are going to be an "Average" classic bike owner and do less than 1,500 miles per year go to Tesco and buy the 10w40 non synthetic Diesel oil as it meets all the original specs and change it every 1,500 or annually

adrian58:
Thanks for all your replies. Think I'll go for mineral 10 40 as it did cause problems in my BMW R80. Just thought SOHC Hondas' might like more modern oils. Just wondering why Bryanj says Diesel best ? Is it something in the specs ?

Bryanj:
YUP mate, newer petrol oil has lots of uneeded additives whilst the Diesel has the one that makes it ideal for use in a combined sump and gearbox. Went through it years ago and the SAE specs we need are all in the Diesel one

Waggles:
I agree with most here, frequent changes are, I think, the most important bit. I read a study once which measured oil viscosity fall ( as a sign the oil was 'wearing out' ) this was with 'ordinary' non synthetic oils, it found that most damage is done after 800 miles in a bike motor and put it down to the fact that the oil is shared with the gearbox. So the recommendation was to change the oil around 1,000 miles to 1,500. If you do that with Synthetic you will get through your bank balance quite quickly!

Synthetics may be better but they still get contaminated by blow by, condensation etc etc etc.

Couldn't help wondering why cars like the original Mini didn't have to change their oil every 1,500 miles as don't they share engine and gearbox oil just the same?

Bryanj:
Look at the BHP per Litre for the explanation mate!!

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