The price of all grades of petrol will drop by 10 cents per litre on Wednesday next week, the energy department says.

The wholesale price of diesel with a 0.05 percent sulphur content would drop by 13 cents per litre, as would diesel with a 0.005 percent sulphur content, the department said.

The wholesale price of illuminating paraffin would decline by 15 cents a litre, while the single maximum national retail price for illuminating paraffin would drop by 20 cents a litre.

A litre of petrol 95 ULP in Gauteng would now cost R8.17.

The department added that during the period under review - July 2 to July 29, 2010 - the average international product prices of petrol, diesel and illuminating paraffin had decreased.

Meanwhile, the average Rand/US Dollar exchange rate for the period had strengthened.

It was 7.5757 compared to 7.6708 during the previous period, the department said.