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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oils again
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<blockquote data-quote="ernie" data-source="post: 27529" data-attributes="member: 63"><p>Well Howard, I just ask a simple question and get some educational stuff back. I used to think that any modern oil is good enough. I would not use a historic quality monograde because the logic is that a multigrade is thinner than your mono when cold and thicker than your mono when hot. And some, like the oil I mentioned in my first post, is thicker still. </p><p></p><p>Historic low detergent mono grade is probably good for old engines that have never been stripped because of the historic sludge in the oilways. </p><p></p><p>The two problems I have read about with modern oils are: first that a high ash content modern oil can cause deposits to build up on your exhaust valve stem and stop it closing. Second, they are leaving some zinc compound out of modern oils which is bad for slidey cam followers like what we got. I was using Halfords 10w-40 mineral for running in my rapide when the front piston nipped up - so never that again. Classic 20-50 was what I always used in the past but I changed to the Halfords cos I could not find any. So now I have found it again I will stick to it - and perhaps add a drop of molyslip for luck.</p><p></p><p>Nevertheless, 10W-60 sounds interesting and there is someone out there who is using it but I do not know how many miles he does. </p><p></p><p>By the way hi Tom Gaynor, where have you been?</p><p></p><p>THis link</p><p></p><p>http://datasheets.bp.com/bpglis/FusionPDS.nsf/0/E5086EF2CA5847A08025789600635023/$file/BPXE-8H6E8W_0.pdf</p><p></p><p>talks about older technology which should good for us?</p></blockquote><p></p>
[QUOTE="ernie, post: 27529, member: 63"] Well Howard, I just ask a simple question and get some educational stuff back. I used to think that any modern oil is good enough. I would not use a historic quality monograde because the logic is that a multigrade is thinner than your mono when cold and thicker than your mono when hot. And some, like the oil I mentioned in my first post, is thicker still. Historic low detergent mono grade is probably good for old engines that have never been stripped because of the historic sludge in the oilways. The two problems I have read about with modern oils are: first that a high ash content modern oil can cause deposits to build up on your exhaust valve stem and stop it closing. Second, they are leaving some zinc compound out of modern oils which is bad for slidey cam followers like what we got. I was using Halfords 10w-40 mineral for running in my rapide when the front piston nipped up - so never that again. Classic 20-50 was what I always used in the past but I changed to the Halfords cos I could not find any. So now I have found it again I will stick to it - and perhaps add a drop of molyslip for luck. Nevertheless, 10W-60 sounds interesting and there is someone out there who is using it but I do not know how many miles he does. By the way hi Tom Gaynor, where have you been? THis link http://datasheets.bp.com/bpglis/FusionPDS.nsf/0/E5086EF2CA5847A08025789600635023/$file/BPXE-8H6E8W_0.pdf talks about older technology which should good for us? [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oils again
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