One tanker of bad diesel can cost you more than a year of savings from the “cheap” supplier who sold it. Contaminated fuel clogs injectors, chokes filters and glazes cylinder walls. A CAT or Mikano set that should run for years ends up on a workshop floor in Ikeja with a repair quote that makes your finance team go quiet. And that’s before you count the hours your production line or estate sat dark.
Choosing a diesel supplier is a risk decision, not a procurement chore. This is how to make it properly.
Vetting for Quality: Don’t Trust the Label, Trust the Paper
Adulterated diesel rarely announces itself. It looks fine in the tanker and fails inside your engine. The usual culprits are water, sediment, and fuel stretched with cheaper products. The symptoms are black smoke, rough running, hard starts and filters that choke every few weeks.
Start with the licence. Any serious supplier should show a valid NMDPRA licence (the regulator that took over from the DPR). Ask for the document and check that it is current, covers the right activity, and matches the company name on the invoice. A supplier who gets defensive about this has told you what you need to know.
Then ask for a certificate of quality or product test report from the depot loading point, covering at least density, flashpoint and water content. Don’t stop at “we have it.” Ask for the batch you are buying. A certificate from last quarter proves nothing about today’s load.
You can also run simple checks yourself on delivery day:
- Look at it. Diesel should be clear to pale amber. Cloudy, unusually dark, or with visible particles in a clear sample jar means a problem.
- Smell it. A sharp kerosene or solvent note is a warning.
- Check density. A hydrometer costs little. Ask your engineer to take a sample from the middle of the load, not the top.
- Test for water. Water-finding paste on a dip rod shows free water at the bottom of the tank instantly.
Keep a sealed sample from every delivery for 30 days. If an engine problem shows up later, you have evidence. Suppliers who know you do this tend to deliver cleaner product.
The Delivery Trick: Make Short-Delivery Expensive for Them
Short-changing is rarely dramatic. It’s 300 litres missing from a 10,000-litre load. Do that across a year of deliveries and the loss is serious money.
Protect yourself at the gate, before the truck touches your tank:
- Insist on a calibration chart for the tanker. Each compartment of a legitimate tanker has a calibrated capacity, and the chart lets you convert a dipstick reading into litres.
- Dip every compartment yourself, before and after discharge. Don’t accept a reading from the driver alone.
- Watch the flow meter from zero. Check that the meter was reset, that it carries a valid calibration seal, and that the hose was full before pumping. Air in the line is a classic way to inflate a reading.
- Compare against your own tank. If you have a tank gauge or a measured dip chart for your storage, reconcile the delivered volume against your own readings.
- Sign only what you’ve verified. The delivery note should state the quantity actually received, the truck number, the driver’s name, and the time.
Assign one person to do this every time, ideally someone who isn’t rushed and whose job isn’t to keep the truck moving. Suppliers adjust their behaviour quickly when they know the receiving officer checks.
Logistics and Reliability: Distance to the Depot Is a Business Risk
A supplier can have perfect fuel and still hurt you if the truck shows up on Thursday when you needed it Tuesday.
Lagos traffic is not a minor inconvenience for fuel delivery. A load leaving Apapa can sit for hours in gridlock on the way to Ikeja, Ilupeju or Oregun. For a plant running on diesel, that delay can mean a shutdown. For a Lekki estate, it means residents calling the facility manager at midnight.
So ask direct questions:
- Where do they load, and how close is that depot to you? Proximity to Apapa or other loading points affects both delivery time and the supplier’s exposure to port-area bottlenecks.
- How big is their fleet? A supplier with two trucks is one breakdown away from missing your delivery. A larger fleet means they can substitute a truck and still keep the promise.
- Do they own the trucks or hire them? Hired trucks mean less control over condition, scheduling and driver conduct.
- What is their emergency protocol? Can they deliver within hours if your level drops unexpectedly? Is there a number you can call at 9pm?
Good suppliers plan around Lagos. They schedule deliveries outside peak hours, keep a buffer, and tell you early when something is delayed. Bad ones say “on the way” for five hours.
Pricing Transparency: If the Quote Looks Too Good, Read It Twice
Diesel prices in Nigeria move, and a good supplier will say so. What you’re looking for isn’t the lowest number. It’s a number you can trust at invoice time.
Watch for these red flags:
- A price that’s far below the market with no explanation. Someone is recovering that margin through lower quality, short volume, or fees added later.
- Ex-depot price quoted as if it were the delivered price. Always ask: is this price delivered to my site, and what is included?
- Hidden extras. Delivery charges, offloading fees, demurrage or “logistics” lines that appear only on the final invoice.
- Confusing bulk with pump pricing. Bulk pricing should be meaningfully different from retail pump prices at your nearest station. If a supplier’s bulk quote barely differs, ask why. If it’s dramatically lower, ask what changed.
- Verbal quotes, WhatsApp-only quotes, or prices “valid today only.”
Ask for a written quotation that states the unit price per litre, volume, delivery location, payment terms, and how long the price holds. Compare invoices against quotes every month. Reliable suppliers explain price movements without being chased: “The depot price moved on Monday, this is the new rate, here’s the basis.”
Treat Your Diesel Supplier Like a Business Partner
Here’s the shift that matters. If you buy diesel by calling five vendors every time and picking the cheapest, you are the one carrying all the risk. Nobody is accountable to you, and nobody learns your site.
Pick one or two suppliers and vet them properly. Visit their depot or at least verify their loading arrangements. Put quality standards, delivery windows and measurement procedures in a short written agreement. Review performance every quarter: delivery times, volume reconciliation, quality incidents, invoice accuracy.
Then pay on time. Suppliers prioritise customers who do, especially when supply is tight. The cheapest litre of diesel is the one that arrives on time, in full, and burns clean in your generator. Everything else is a repair bill waiting to happen.
