--- title: AdBlue in a Diesel Tank Stonesfield: Explained canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/stonesfield-oxfordshire/ location: Stonesfield county: Oxfordshire latitude: 51.851750 longitude: -1.432450 service: AdBlue in a Diesel Tank updated: 2026-10-11 --- # Preventing AdBlue in a Diesel Tank in Stonesfield: Why It Happens If AdBlue is already in your diesel tank, stop reading for a moment: leave the engine and the ignition off then call 0333 366 0103. Caught before your engine runs, it's usually a drain and a thorough flush, done where the vehicle is in Stonesfield. If you're reading before it has happened, the rest of this page is about why it takes place and how to make sure it doesn't. ## Two fillers, two tanks: AdBlue in a diesel vehicle Diesel goes to your engine — yet many modern diesels driven around Stonesfield and East End hold a second fluid too. Stored in a tank of its own, AdBlue is fed into the exhaust stream to clean it. Every tank has a filler of its own. Many of cars have a single flap for both, while some move the AdBlue filler to your boot or under the bonnet. The diesel side is filled at the petrol pump all the time. The AdBlue side is topped up far less commonly, normally from a bottle, and normally by somebody who has to stop and think where it goes. That gap is where the error lives. ## Stonesfield: how AdBlue in your diesel tank occurs Rarely is it carelessness: normally three things coincide. On a driveway off Churchfields before work, or in the car park at The White Horse heading home: that's where the hurried top-up takes place. Why the rush? As AdBlue runs low your car tells you, and if it is empty, limp mode kicks in. Unfamiliar cars come next, too. Rentals, new motors and company vehicles place their fillers in new places, and habit goes for the cap used on the old one. Nothing stops the tip after it has started, because a bottle with a spout goes into a diesel filler as easily as an AdBlue one. The bottle fits. Whether it happens in Fawler or the middle of Stonesfield, it's the same few seconds. ## The AdBlue filler and the diesel filler: telling them apart A few seconds is all the checks take — so check them before you pour anything, on a drive in Woodleys or a forecourt around Stonesfield. - Where it sits can mislead; the cap does not. AdBlue ones are often blue or carry the word "AdBlue" — diesel caps normally don't. - On plenty of vehicles, size gives it away: AdBlue has the smaller filler neck. - A label inside the fuel flap often says which fuel goes where, on plenty of motors. Check for it. - The handbook. If the filler isn't by your diesel cap, it is in the boot or under the bonnet, and the handbook says which. - The person who drove the car last. On a hire or company car picked up from somewhere like the car park at Finstock, ask before you leave, not when the light comes on. ## Keeping AdBlue out of your diesel tank when you top up A routine for the day the light comes on, wherever across Oxfordshire that is. - Park then switch off. Not on a slope, not with the engine running, and not in a rush on the side of High Street. - Find the AdBlue filler and read the cap. Say "AdBlue" out loud as you unscrew it. It sounds silly and it does the trick. - If both sit under one flap, check your diesel cap is still closed before you lift the bottle — then leave it on. - Finish once the tank is topped up or the bottle is empty; until then, pour gently through the built-in spout. - Close the cap and check a second time. Make sure the diesel cap was never opened. Only then start the vehicle. Discover during the second or third stage that the bottle went into the diesel tank? That's where you stop. Leave out stage five altogether. ## Already put AdBlue in the diesel tank in Stonesfield? What follows is a short order of things, starting with no starting your engine. Leave the ignition off as well, since on plenty of diesels switching it on by itself starts your pump. Don't top up with diesel to dilute it: AdBlue doesn't mix with diesel, it sinks to the bottom of that tank, where your fuel is pulled from. Ask the staff to help roll the vehicle clear of the petrol pump if you are at a forecourt — the Gulf, the Texaco or somewhere else. Your own driveway around Stonesfield is where it should stay. Already started? Pull over when it's safe, then turn off. The next junction is the place to come off when you're on the M40, under 15 miles from Stonesfield. About how far did it go? Crossing Stonesfield is less a job than a run of under 15 miles towards Oxford, and so say. ## What happens when our technicians arrive around Stonesfield Wherever the vehicle came to rest, whether outside Stonesfield Primary School, beside Stonesfield Methodist Chapel or at home, the van travels to it. Both the work and the price rest on three answers — which liquid, which quantity, and if it's run — so our technicians ask. You hear that quote by phone, before anyone heads out. After that: draining, then a full flush of the whole system. Much more than with petrol, it matters with AdBlue: crystals form, some metals are attacked, and none of it clears out on its own, however long it sits. Testing is at the end: before that, clean diesel is added, and your filter is flushed or changed if necessary. Then our engineers start the engine and check it runs correctly before leaving. If your engine hasn't run, most jobs take about half an hour once we are there, using pumps that are fine on a working forecourt and quiet enough to use outside a house at night. No money in advance; you settle up on the day. At the end, a VAT invoice and a report from the engineer go to you for the insurer. Misfuelling cover is part of many insurance policies — so make use of the wait to check yours. ## About Stonesfield and where it is Stonesfield is a village in Oxfordshire, situated on the banks of the River Evenlode at an elevation of around 118 metres. Stonesfield lies approximately 10 miles west of Oxford and 60 miles from London, with nearby villages including Fawler, Combe, and Wilcote. Stonesfield has a population of around 1264 people, predominantly living in detached houses. ## AdBlue drains around Stonesfield and across Oxfordshire Combe and Wilcote are among the places near Stonesfield, a village, that the same teams cover, throughout OX postcodes. Fastest of all: give a OX29 8 postcode to our van. The car stays where it is. Wherever it sits — beside Saint James The Great, in a lay-by en route to Green, at home — that is where it gets emptied. Assuming doesn't help behind Stonesfield Library, close to a boundary, or somewhere awkward to describe; ring and check. ## In short, for Stonesfield motorists Before you tip, read the cap. AdBlue in your diesel tank regardless? Leave it off and call 0333 366 0103; Petrol in Diesel empties it where it stands, throughout Oxfordshire.