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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Motor Oil - Fossil or Synthetic
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<blockquote data-quote="ET43" data-source="post: 18687" data-attributes="member: 62"><p>I have ever only used a multigrade oil once, it was Duckhams 20/50 and I have to say that I have put litmus paper into a similar coloured fluid that was thicker! Up to the time I dismantled the red thruster I used sae 30 in the winter and sae 40 in the summer. This is because I had read somewhere that big end roller bearings chopped the polymers around in the thinner multigrade oil, hence the use of monogrades' , but a good friend, late of the oil industry, tells me that this is not true of modern oils. Can anyone confirm or deny this please? I remember Phil Irving saying that if one used the machine for short journeys, then sae 20 would be fine.</p><p>Now then Sonny, let's be 'aving the truth. ET43</p></blockquote><p></p>
[QUOTE="ET43, post: 18687, member: 62"] I have ever only used a multigrade oil once, it was Duckhams 20/50 and I have to say that I have put litmus paper into a similar coloured fluid that was thicker! Up to the time I dismantled the red thruster I used sae 30 in the winter and sae 40 in the summer. This is because I had read somewhere that big end roller bearings chopped the polymers around in the thinner multigrade oil, hence the use of monogrades' , but a good friend, late of the oil industry, tells me that this is not true of modern oils. Can anyone confirm or deny this please? I remember Phil Irving saying that if one used the machine for short journeys, then sae 20 would be fine. Now then Sonny, let's be 'aving the truth. ET43 [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Motor Oil - Fossil or Synthetic
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