--- title: Explained: AdBlue in a Diesel Tank Cockerton canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/cockerton-durham/ location: Cockerton county: Durham latitude: 54.534700 longitude: -1.582080 service: AdBlue in a Diesel Tank updated: 2026-10-19 --- # AdBlue in a Diesel Tank in Cockerton: How It Happens and How to Avoid It AdBlue already in your diesel tank? Then set this page down a moment, keep the ignition and motor off, and phone 0333 366 0103. Around Cockerton, finding it before the motor runs normally leaves draining and a full flush where it stands. The remainder of this page covers why it takes place and how to ensure it doesn't — handy if you are reading ahead of time. ## Two fillers, two tanks: AdBlue in a diesel motor Many newer diesels in Hummersknott, as well as Cockerton, run on two fluids; your motor gets just the diesel. Kept in a tank of its own, AdBlue is fed into the exhaust gas and cleans it. There's a filler for every tank. On a lot of vehicles the two sit side by side under the same flap; on others the AdBlue filler is in your boot or under the bonnet. The diesel side is fuelled at the petrol pump all the time. Rarely topped up, AdBlue usually comes out of a bottle, poured by someone who has to stop and think what filler it needs. The error lives in that gap. ## How AdBlue in the diesel tank occurs in Cockerton Carelessness seldom causes it. What does is three things coming up at once. The warning comes first. As AdBlue runs low the car tells you, and if it runs out altogether, the car drops into limp mode. So the top-up is done in a hurry: on a drive off Cockerton Green before work, or in the car park outside Travellers Rest on the way home. Next, the hand reaches for the cap it knew on the old vehicle — because a hire car, a new vehicle or a company car places the fillers somewhere your last one did not. A spout-topped bottle meets no resistance at a diesel filler no more than at an AdBlue one. So the tip, after started, keeps on. It takes seconds, be it out in Pierremont or bang in the heart of Cockerton. ## The AdBlue filler and your diesel filler: telling them apart Look at these before pouring, at a forecourt in Cockerton or a drive over in Hope Town. A few seconds, no more. - Colour and lettering: an AdBlue cap is often blue, or says "AdBlue", where a diesel cap usually doesn't. Trust the cap, not its position. - Plenty of motors give AdBlue the smaller neck of the two. - Look inside your fuel flap: many vehicles carry a label there saying which fuel goes where. - In your boot or under the bonnet: that's where the filler is if it is not by your diesel cap, and the handbook tells you which. - The person who drove the vehicle last. On a hire or company car collected from somewhere like the car park at North Road, ask before you leave, not when the light comes on. ## AdBlue top-ups that never reach the diesel tank Anywhere in Durham the light comes on, here is a routine for the day. - Park then switch off. Not on a slope, not with the motor running, and not in a rush on the side of Hill Garth. - Silly as it sounds, speaking "AdBlue" out loud while you unscrew the cap does the trick — after you've found the filler and read the cap. - The diesel cap stays on. When both sit under a flap, confirm it's shut before lifting the bottle. - Stop when your tank fills or the bottle is empty; before that, pour slowly through its own spout. - Before starting the vehicle, shut the cap and look again that your diesel cap was never opened off. If at stage two or three you find you have already poured into the diesel side, stop there. Step five is off limits. ## Cockerton: already put AdBlue in your diesel tank? Do not start your motor: that is how the short order of things begins. The fuel pump runs on plenty of diesels the moment your ignition goes on — and so keep it off. Topping up with diesel won't thin it: instead, AdBlue sinks to the base of your tank, right where fuel is taken from. On a forecourt — Shell, Morrisons or any other — the attendants will usually help roll your car away, when you ask. If you are on your own drive around Cockerton, leave the vehicle where it is. Already started? Pull over once it's sensible, then switch off. Cockerton sits under 3 miles from the A1(M); there, take the next junction. Tell us roughly how far it went: a run towards Durham, under 25 miles away, is a bigger job than a short hop across Cockerton. ## Cockerton: what takes place when we turn up Anywhere the vehicle has stopped, whether by St Mary's Cockerton Church of England Primary School, beside St Mary or on your own drive, our van comes to it. The replies settle the work and our quote, and so we ask what was put in, roughly how much, and whether it has run. On the call itself, you hear the quote — before dispatch. Then your tank is drained and the fuel system rinsed thoroughly. More than with petrol, it counts with AdBlue: crystals build up, certain metals corrode, and none of that clears out on its own, however long it sits. Testing comes at the end: before that, clean diesel goes in, and your filter is flushed or replaced as needed. The motor is started next and checked to be sure it runs correctly, all before our technicians go. Unstarted cars mostly mean a half-hour visit from the moment we arrive. The kit is safe on a live forecourt, and quiet enough for a driveway after dark. The insurer usually wants an engineer's report and your VAT invoice, and both are yours at the end. Payment comes on the day, with no money upfront. Many insurance policies include misfuelling cover, so it's worth checking yours while we are on the way. ## About Cockerton and where it is Cockerton is a suburban area situated on the riverside in County Durham, with a mix of semi-detached housing and other residential properties. Cockerton sits at an elevation of 54 metres, near the communities of Pierremont, Branksome, and Mowden. Cockerton is located approximately 16.8 miles from the city of Durham and 217.7 miles from London. Cockerton has a population of around 6961 residents. ## Cockerton and Durham: AdBlue drains across the area Throughout DL postcodes, our vans covering Cockerton — a residential suburb — work the surrounding places too, Mowden and Branksome included. The van gets to you fastest with a postcode starting DL3 9. No need to move the car. A drive, a lay-by on the way to Cockerton Green, a side street near Holy Family Roman Catholic Church: our technicians drain it where it is. Tricky to explain, like the back of Cockerton Methodist? Close to a county line? Checking beats assuming, so ring. ## For Cockerton motorists, the short version First, the cap; then, the pour. AdBlue in your diesel tank regardless? Keep it off then call 0333 366 0103; Petrol in Diesel drains it where it stands, throughout Durham.