--- title: Explained: AdBlue in a Diesel Tank Rothwell canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/rothwell-northamptonshire/ location: Rothwell county: Northamptonshire latitude: 52.422930 longitude: -0.798560 service: AdBlue in a Diesel Tank updated: 2026-10-23 --- # How It Happens and How to Prevent It: AdBlue in a Diesel Tank in Rothwell Stop here for a moment if the diesel tank already holds AdBlue in it: ignition off, motor off, and ring 0333 366 0103. Usually, when the motor hasn't run, it's drained and fully cleaned where the vehicle sits around Rothwell. The rest of this page explains why it occurs and how to ensure it does not — useful if you're reading ahead of time. ## Two fillers, two tanks: AdBlue in a diesel motor Many newer diesels around Rushton, like those in Rothwell, carry on two fluids; the engine takes just your diesel. AdBlue's own tank keeps it, and from there it goes to the exhaust, where spraying treats the fumes. Different tanks, different fillers. Other vehicles put the AdBlue filler in your boot or under the bonnet; plenty of others have both together behind one flap. At the pump, your diesel side is topped up all the time. Seldom topped up, AdBlue usually goes in from a bottle, poured by a driver who has to stop and think which cap it needs. That gap is where the mistake lives. ## How AdBlue in your diesel tank takes place around Rothwell Three things tend to line up, and carelessness is rarely one of them. To start with, the warning. Low AdBlue triggers a message from the vehicle, and letting it run out means limp mode — hence a hurried top-up, perhaps before work off New Street, or outside The Blue Bell on the way home after work. Then the vehicle is strange. A hire car, a new motor or a company car puts the fillers where your last one didn't, and the hand reaches for the cap it would have used on the old one. And the bottle fits. A bottle with a spout goes into a diesel filler as easily as an AdBlue one, so nothing stops the tip once it has started. It takes seconds, be it out in Orton or bang in the heart of Rothwell. ## Which filler is for AdBlue, and which for diesel? A few seconds is all these take — so run through them before you tip anything, on a drive in Thorpe Malsor or a forecourt in Rothwell. - Check the cap rather than going by where it sits: AdBlue ones are commonly blue or marked "AdBlue", and diesel ones usually are not. - Plenty of cars give AdBlue the smaller neck of the two. - A label inside your fuel flap frequently shows which fuel goes where, on many motors. Check for it. - Can't see it next to the diesel filler? Then check below the bonnet or in the boot — the owner's manual will say which. - The person who drove the car last. On a hire or company car picked up from somewhere like the car park outside Kettering, ask before you leave, not when the light comes on. ## Topping up AdBlue without it reaching the diesel tank A routine for the day the light comes on, wherever around Northamptonshire that is. - Stop on level, motor off, with time to spare — not hurried on the side of Glendon Road. - Silly as it sounds, speaking "AdBlue" out loud while you unscrew the cap works — once you've found the filler and read the cap. - If both sit under one flap, check the diesel cap is still closed before you lift the bottle — and leave the car on. - Using the bottle's own spout, pour slowly — and stop when it is full or the bottle is empty. - Close the cap, then check once more — making sure the diesel filler remained shut throughout. After that, start the car. Discover during the second or third step that the bottle went in the wrong tank? That's where you stop. Step five is out. ## Rothwell: already put AdBlue in your diesel tank? Do not start your engine: that is where the short order of things starts. Don't switch the ignition on; on many diesels that alone runs the fuel pump. Filling up with diesel will not dilute it: instead, AdBlue drops to the bottom of the tank, right where fuel is taken from. Ask the attendants to help push the vehicle away from the petrol pump if you're at a forecourt — the Esso, the another forecourt nearby or somewhere else. If you're on your own driveway around Rothwell, leave the vehicle where it stands. Already run? Pull over once it's sensible, then turn off. On the M6, under 25 miles from Rothwell, that means the next junction. A short hop across Rothwell is a smaller job than a run towards Leicester, under 25 miles away, and so tell us roughly how far it went. ## Our arrival in Rothwell, and what takes place next By Rothwell Junior School, near Rothwell Library or on your own drive: wherever the car has stopped, we come to it. We ask what got in, about how much, and if it has run, since those answers determine this work and the price. The quote comes over the phone, before any van leaves. The fuel system is then purged thoroughly, after that tank is cleared. Not like petrol, AdBlue forms crystals and attacks certain fuel-system metals, and neither washes out by itself. Hence it counts more. Your filter is cleaned, or replaced where it needs to be; fresh diesel goes in; and the car is tested. Before we go, our engineers start it and make sure that it is running properly. Unrun cars mostly need a half-hour visit after the moment we arrive. The kit is fine on a live forecourt, and hushed enough for a driveway after dark. Your insurer usually wants an engineer's report and your VAT invoice, and you get both at the end. Payment is on the day, with no money upfront. Wrong-fuel cover is part of plenty of insurance policies — so make use of the wait to check yours. ## About Rothwell Rothwell is a village in Northamptonshire, situated on the riverside at an elevation of 122 metres, with a mix of terraced housing and other residential properties. Rothwell lies near several other villages, including Orton, Desborough, and Loddington, and is approximately 20 miles from Leicester. Rothwell has a population of around 4263 people and is located about 69 miles northwest of London. Rothwell remains a relatively small community with a strong sense of local identity. ## Rothwell and Northamptonshire: AdBlue drains across the area Rothwell is a village, and the vans that cover it also work the towns near it, Desborough and Loddington among them, across the NN postcode area. A postcode starting NN14 6 gets the van to you fastest. The vehicle stays put. Draining takes place right there, be it a drive, a street by Rothwell Methodist Church, or a lay-by on the way to Manor Park. Tricky to explain, like the back of Rothwell Community Centre? By a county line? Checking beats guessing, and so phone. ## For Rothwell people, the short version Before you tip, read the cap. If AdBlue has gone in the diesel tank regardless, leave the vehicle off then phone 0333 366 0103. Petrol in Diesel empties it where it sits, anywhere around Northamptonshire.