Could Red Sea disruption push up South Africa’s petrol and diesel prices?

Disruption to shipping near the Red Sea could add to the pressure on South Africa’s petrol and diesel prices. There is reason to watch the next adjustment closely. There is not enough evidence to turn a headline about a shipping route into a precise increase at your local garage.

In its September statement, the South African Reserve Bank warned that interrupted oil supplies and the conflict in the Middle East were adding to inflation pressure. It also reported a petrol under-recovery of R2.83 per litre at that point. That figure describes pressure in the pricing calculation. It is not an announced October pump-price increase. SARB statement

What is happening at Bab el-Mandeb?

Bab el-Mandeb is the narrow passage between the Red Sea and the Gulf of Aden. It forms part of the shipping route that continues north through the Suez Canal. The Strait of Hormuz is a different waterway, serving the Persian Gulf. Both matter to energy trade, but disruption at one should not be reported as a closure of the other. EIA background

AP reported on 11 September that Houthi advances near Bab el-Mandeb had increased risks to shipping, including restrictions affecting Saudi-linked vessels. That supports describing the situation as serious disruption. It does not establish that the entire strait is closed to every ship. AP report

For motorists, the useful question is how those difficulties might reach the fuel bill.

How a shipping problem becomes a fuel-cost problem

When ships avoid a route, the alternative can take longer and cost more. The US Energy Information Administration documented that effect during earlier Red Sea disruption, when vessels diverted around the Cape of Good Hope. That is background evidence of the mechanism, not a measurement of today’s extra costs. EIA analysis

South Africa’s fuel calculation reflects international refined-product prices and shipping-related costs, converted into rand. A stronger rand can soften a dollar-price increase; a weaker rand can make it harder to absorb. Local levies, margins and transport charges also contribute. DMPR pricing explanation

This is why “oil went up by 10%, so petrol must go up by 10%” is not a reliable calculation. The number on a crude-oil chart is only part of the story.

Why petrol and diesel headlines can differ

Petrol and diesel have separate product-price inputs. Their adjustments need not match. There is also a difference at the forecourt: petrol’s retail price is regulated, while the published diesel figure is a wholesale price and the retail price can vary. DMPR pricing explanation

For a Cape Town budget, use the coastal petrol price for the relevant grade. If you drive a diesel bakkie, check the actual price at the station you use. An inland petrol figure or a diesel wholesale headline is an easy way to start with the wrong number.

What would an increase mean for a tank?

You do not need a perfect forecast to test your budget. Multiply the possible change per litre by the litres you expect to buy.

These are examples, not predictions. They assume you buy the same amount of fuel after the change.

For a distance-based example, suppose you drive 1,000 km a month and your car averages 7.5 litres per 100 km. You would use about 75 litres. A R1-per-litre increase would add about R75 to that month’s fuel cost. Substitute your own distance and consumption; the school run and the drive to work do not look the same for everyone.

What to check before the next adjustment

Look for the date attached to an estimate, the fuel grade and whether it refers to retail or wholesale pricing. South Africa’s monthly adjustment uses averages from the preceding review period, so a daily indicator can change before the final announcement. DMPR pricing explanation

Treat the department’s final announcement and applicable price schedule as the confirmation. A forecast can help you leave room in the budget, but it cannot promise what your next fill will cost.

If you want to go beyond the fuel line, use our guide to working out the full cost of your Cape Town commute. Parking, servicing and tyres still belong in the calculation, even when petrol gets most of the attention.

Sources

• South African Reserve Bank: September 2026 Monetary Policy Committee statement. Source for the current supply-pressure assessment and dated petrol indicator.
• Associated Press, 11 September 2026: The Houthi advance in Yemen raises concerns about a key shipping choke point. Source for attributed reporting on Bab el-Mandeb.
• Department of Mineral and Petroleum Resources: Fuel price structure. Source for pricing inputs, monthly averaging and the petrol/diesel distinction.
• US Energy Information Administration: World oil transit chokepoints and Red Sea attacks increase shipping times and freight rates. Background on geography and the effect of diversions, not confirmation of current route closures.

Sources checked on 24 September 2026. Budget examples are Motor Maat calculations using the assumptions shown. Shipping conditions and price indicators can change after this date.