The Bajaj Chetak is an Indian copy of a Vespa. Modern two strokes, including Vespas, usually use 50 parts petrol to one part two stroke oil. So, five liters of petrol would need 100ml. of two stroke oil. I wouldn't use engine oil except in an emergency.
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how much Engine Oir to be used per litre of petrol for Bajaj Chetak Scooter of 1995 model