Have a look on the website the instructions might be on there. Or ask tomorrow!
ok point taken it was a long shot asking a MM assistant. Have you looked on clarkes website clarkinternation.com?
Is it critical what SAE as there isn't a huge differ ace between 30 and 40 is there?
maybe you should use SAE 30 In the winter and SAE 40 In the summer
SAE 40 on my clark petrol driven if thats any help.