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Best I have ever used has been Castrol RS. Not used teh New Castrol Edge stuff. Found Mobil 1 Motorsport not that good (15w50 for summer use) and have used Total Quartz 7000, Duckhams QXR and Halfords own Semi Synthetics.
Just got 20l of Silkolene Pro S from Oilman. A steel at just over £28 a 5 litre bottle delivered free (when you buy 20l) and compare that to IRO £36 for 4l of Castrol or Mobil equivalent.
And by all accounts Silkolene seems to be better Ester based oil.
The ultimate and best lubricant of them all is Castor oil, however it is natural so degrades fast and has no ability to become a multigrade, but its the best.