Clutch and oil questions

foxbass

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I know the subject of oil has been done to death but please humour me for a mo.

My s2 has been running quite happily (I think) on Motul 300v 15 50 synthetic for over a year. I know its way above spec but I came by a load of it cheap.
Came time for a service recently and I changed to Silkolene Super 4 semi synth 20 50. Within days the clutch was needing regular adjustment. In short it appears to be worn out at 31000 miles. New one going in imminently!
My question therefore is, should I go back to the fully synth which seemed to work fine or ditch it in favour of the exact spec?
My riding is a lot of stop/start commuting across London with the bike's fan regularly kicking in every journey during the summer.

Also, is there a test/indication that will certify a knackered clutch? Lever is quite stiff now despite a proper lube job on the cable just days ago. Have checked for fraying/kinks. Clutch seems to start dragging as it gets hot - as in the bike creeps at lights in gear/clutch out.

Any input well received!
 
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