SOHC.co.uk Forums > CB350/400
Oil Change
Rob62:
Putting automibile oil into a motorcycle with a wet clutch was always a no no wasnt it?... especially as there are dozens of suitable options specially formulated for motorcycles...
Halfords do a mineral multigrade specially for bikes, why bither with the deisel car stuff.... beats me.
Trigger:
--- Quote from: Rob62 on October 22, 2017, 08:23:55 AM ---Putting automibile oil into a motorcycle with a wet clutch was always a no no wasnt it?... especially as there are dozens of suitable options specially formulated for motorcycles...
Halfords do a mineral multigrade specially for bikes, why bither with the deisel car stuff.... beats me.
--- End quote ---
As a engineer I know that oil is formulated in grades for engines and not for motorcycles. They put a nice picture of a bike on the label and then charge more £££. As people like Bryan and myself have worked in the bike trade for many years, we know not to look at the fancy labels and read the spec on the back ;)
royhall:
--- Quote from: Rob62 on October 22, 2017, 08:23:55 AM ---Putting automibile oil into a motorcycle with a wet clutch was always a no no wasnt it?... especially as there are dozens of suitable options specially formulated for motorcycles...
Halfords do a mineral multigrade specially for bikes, why bither with the deisel car stuff.... beats me.
--- End quote ---
Cheers Rob that's good to know. Last time I checked Halfords it was part or fully synthetic and not motorcycle specific. Was quite a while ago though so will check again. To make it easy, do you have an online link for the one your talking about. Cheers.
Rob62:
The stuff in the middle is what i was referring to roy. I use it on the RD which is obviously a 2t.... personally I wouldn’t use it on a 4 stroke, classic or otherwise, but it is a basic mineral multigrade with no anti-friction additives that could potentially build up and damage your wet clutch plates. Its labelled gear oil but is mineral multigrade not hypoid..... I would use a semi synth like either of the two oils next to it..... specialy formulated for bikes, relatively cheap and easily obtainable.. My advice would always be to use good quality oil and fuel for decent performance and longevity but at the end of the day its up to the individual.... decent oil is relatively cheap (although some is very expensive and a waste on low performance motors like these), engine rebuilds not so cheap, especially ageing classics.
matthewmosse:
With oils I go with a decent price per litre. Avoid synthetic, - I found Comma 10/40w semi synthetic caused bad clutch slip, took 3k miles and 2 oil changes to get it working right again. I used to use Silkolene but the price doubled and advice on this forum pointed to reading the specifications on the back, as did my bike mechanic friend who's advice I value as he is quite into his classics and has a lot of experience. Since then I tend towards 'fleet oils' suitable for petrols and diesels as you can by shopping around get 25l drums for about what some places charge for 5l of oil that is the same specification. Given my sidecar cb500/4 cleared 200k miles on her original engine with no more than 1500 mile oil changes ( I think she was on 50k when I got her with oil like tar and a slipping starter clutch) the pistons were ok when I stripped it down, just needs new rings - I found after a few years the oil was coming out almost clean looking at 1500 mile changes so I stretched it a bit. Regular changes in my books are better than spending a fortune.
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