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Hi Francis my name is ***** ***** i will assist you. So the correct fuel to oil ratio for your engine is 50:1. So for 23 liters you should add slightly less then 1/2 a liter of oil as 1/2 a liter is with 25 liters. Thus for the age of your engine i suggest you add 1/2 liter it would not do any harm. as for the year for your engine it is a 1984 model.
If you require further assistance let me know.