The minimum amount you can order is 500 litres. The average order is 1,000 litres. Domestic tanks typically range in size from 1,000 litres to 2,700 litres. If you do not have a gauge to tell you how much oil you have used, some tanks have a sight tube on the outside so you can see how full your tank is.
If you have neither, then a garden cane or similar can be dipped in the tank to act as a dip-stick to give an indication of the oil level.
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