As per the manual in the parts list and manuals area of this forum it suggest that you use 1/2 pint of Castrol XL (S.A.E 30) to 10 pints of petrol. If you run at 25 to 1 that should be ok.
As to the tag I am unable to help with that as I have not come across that before.
I have one of the 14" Atco mowers in my workshop that I have had for a long time also a 20" Atco.
