SOHC.co.uk Forums > CB750

What engine oil

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Craizeehair:
Thanks for the replies all, the reason I’m overthinking it is my gear change has become very crunchy, I’m pretty sure it’s worse as it gets warm, Hondaman definitely recommends 20w50 as first port of call but I’ve also noticed my clutch has become very stiff.

His advice of check the oil first had me thinking if I have the right oil, I guess it’s a process of elimination but just trying to figure out where to start first?

McCabe-Thiele (Ted):

--- Quote from: Skoti on March 07, 2026, 09:13:55 PM ---Aye Bryan,

Same here, we always used 10W/40 Castrol, and during winter time 10W/30 Castrolite in Honda stepthru's etc.

Anyone else remember Castrolite oil from the Seventies?

--- End quote ---

When I was 15 (1963)  I used to work on a petrol forecourt at weekends, one of my jobs on Sundays was to fill up the 1 pint and 0ne quart Castrol Oil Glass Jars that had a wire clamp lid up to the measure line with either Catsrol L, XL or XXL although the name rings a distant bell I had to Google Castrolite to find it was an early Multigrade oil launched in 1948. I do remember Castrol GTX coming onto the market, at that time the forecourt sold more Duckhams 20/50, the cheaper alternative was either Redex Motor Oil or the locally produced Silkolene Oil that was said to be recycled  oil made in the Belper Refinery.

Bryanj:
One dealer i worked for used nothing but Silkolene until he got big enough for Castrol to offer him a bulk tank

SteveD CB500K0:



Watercress Line at Alresford Station.

“If it’s good enough for the Flying Scotsman…”


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