recommended oil

[philwright]

Hi All, probably done to death but i'm due for new oil and filter on my 88J slingshot, any recommendations as to which oil/viscosity to use or will anything ( within reason ) do,i changed it a couple of years ago when I first bought it but for the life of me I cant  recall what I used....ta in advance.

[banoffee]

Rule 8.

I use Castrol semi 10W40 though.