Club 80-90 Forums

Gonna do an oil change on my 2ltr Aircooled auto, and looking in the Haynes it says to use 15/50, but the Wiki says 15/40. Which one anybody? Also, my speedo says it's done 203000 kms, so I thought maybe the 15/50 would be better. Any thoughts gratefully appreciated.

Over winter I use a 15/50 then change for the summer to 20/50 always castrol or Duckhams