--- title: AdBlue in a Diesel Tank Charlbury: Explained canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/charlbury-oxfordshire/ location: Charlbury county: Oxfordshire latitude: 51.872710 longitude: -1.482440 service: AdBlue in a Diesel Tank updated: 2026-10-10 --- # How It Happens and How to Prevent It: AdBlue in a Diesel Tank in Charlbury If AdBlue is already in your diesel tank, stop reading for a moment: leave your engine and your ignition off then phone 0333 366 0103. Usually, if the motor hasn't turned, it is drained and thoroughly purged where your car is in Charlbury. Here in advance? Then the rest explains how it happens and how to stop it happening at all. ## AdBlue in a diesel vehicle: two tanks, two fillers Many modern diesels around Shorthampton, like those in Charlbury, run on two liquids; the engine gets only your diesel. Kept in a tank of its own, AdBlue is sprayed into your exhaust stream and cleans it. There's a filler on every tank. Plenty of vehicles share a single flap for the two, while others move the AdBlue filler to your boot or under the bonnet. At the petrol pump, the diesel side gets filled constantly. Much less regularly, the AdBlue side is filled — mostly from a bottle, by someone thinking about where it goes. Mistakes happen in that gap between the two. ## How AdBlue in the diesel tank happens in Charlbury Carelessness rarely causes it. Instead is three things lining up at once. First, the warning. Low AdBlue brings a warning from the vehicle, and letting it run dry means limp mode — so a hurried top-up, perhaps before work off Market Street, or outside Rose and Crown on the way home after work. Unfamiliar vehicles come next, too. Rentals, new motors and company motors put their fillers in new places, and habit goes for the cap it used on the old one. Third, the bottle fits: a diesel filler or AdBlue one, it goes in just as readily, and after the pour begins, no part halts it. It takes a few seconds, whether out in Spelsbury or bang in the heart of Charlbury. ## The AdBlue filler and the diesel filler: telling them apart Look at these before pouring, at a forecourt around Charlbury or a driveway out in Dean. A few seconds, that's all. - The cap. The AdBlue cap is often blue, or marked "AdBlue". The diesel cap usually isn't. Read it instead of going by where it sits. - Check the size: the smaller filler neck is, on plenty of cars, the AdBlue one. - A label inside your fuel flap frequently shows which fuel goes where, on plenty of motors. Look for it. - The handbook. If your filler isn't by your diesel cap, it is in the boot or under the bonnet, and the handbook says which. - Check with the person who drove it last — before you leave, not when the light comes on — when you pick up a hire or company car from somewhere like the car park outside the nearest station. ## 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. - Switch off after you park — level ground, engine off, and never in a rush beside Sheep Street at the roadside. - Find the AdBlue filler and read the cap. Say "AdBlue" out loud as you unscrew it. It sounds daft and it works. - The two behind a single flap? So make sure the lid on the diesel side is still closed before lifting the bottle. - Stop when the tank fills or the bottle is empty; until then, pour slowly through its built-in spout. - Close the cap and check once more. Make sure your diesel cap was never opened. Only then start the car. Find at step two or three that it has already gone into your diesel side? So stop right there. Don't go on to stage five. ## AdBlue in the diesel tank already, around Charlbury? What follows is a short order of things, starting with not starting the engine. Leave the ignition off too, because on many diesels switching it on alone runs the fuel pump. Topping up with diesel will not weaken it: instead, AdBlue drops to the base of the tank, right where the fuel is drawn from. The staff at Texaco, Gulf or any forecourt will normally help to push your car clear if you ask. On your own drive in Charlbury? Then the vehicle remains where it is. Already started? Stop when it's sensible, then switch off. Come off the M40 — under 15 miles out of Charlbury — at the next junction. A short hop across Charlbury is a smaller job than a run towards Oxford, under 15 miles away, and so tell us roughly how far it went. ## What happens when our technicians get there around Charlbury Our van comes to the vehicle anywhere it stopped — your own driveway, beside Corner House, or by Charlbury Primary School. Both the work and the price rest on three answers — what liquid, what amount, and if it's run — so our technicians ask. You hear that quote on the phone, before anybody sets off. Your system is then purged thoroughly, once your tank is cleared. Unlike petrol, AdBlue leaves crystals and eats at certain fuel-system metals, and none of that washes out by itself. That is why it matters more. The fuel filter is cleaned, or replaced where it needs to be; clean diesel goes in; and your car is tested. We don't leave until it has been started and is running correctly. Most jobs are done in about half an hour once our engineers get there, provided your engine hasn't run — and the pumps we use are fine on a live forecourt yet quiet at night outside a house. You pay on the day, with nothing upfront, and get a VAT invoice and an engineer report for your insurer. It's worth checking your policy as the van travels to you: misfuelling cover comes with plenty of policies. ## About Charlbury itself Charlbury is a small town in Oxfordshire, situated on the banks of the River Evenlode at an elevation of around 111 metres. Charlbury lies near the Cotswold Area of Outstanding Natural Beauty, close to the villages of Spelsbury, Taston, and Fawler. Charlbury has a mix of housing types, with semi-detached homes being particularly prevalent. Charlbury is located approximately 12.7 miles from Oxford and 63.3 miles from London. ## AdBlue drains across Oxfordshire, Charlbury included Throughout OX postcodes, the vans covering Charlbury — a riverside town — work the nearby places too, Fawler and Taston among them. Quickest of all: quote a OX7 3 postcode to our van. The car does not need to move. We drain it where it is — a side street near Charlbury Museum, a lay-by on the way to The Playing Close, a drive. Awkward to pin down, like the back of Memorial Hall? Close to a border? Asking is better than guessing, so ring. ## In short, for Charlbury people First, the cap; after that, the tip. AdBlue in your diesel tank regardless? Leave it off and call 0333 366 0103; Petrol in Diesel drains it where it stands, throughout Oxfordshire.