--- title: AdBlue in a Diesel Tank Wern: Explained canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/wern-shropshire/ location: Wern county: Shropshire latitude: 52.908730 longitude: -3.069400 service: AdBlue in a Diesel Tank updated: 2026-10-01 --- # How It Happens and How to Prevent It: AdBlue in a Diesel Tank in Wern Pause here for a moment when your diesel tank already has AdBlue in it: ignition off, engine off, and call 0333 366 0103. Around Wern, finding it before your engine runs usually means a drain and a thorough flush on the spot. The rest of this page explains why it occurs and how to ensure it doesn't — useful if you're reading before it has happened. ## AdBlue in a diesel motor: two tanks, two fillers Plenty of modern diesels in Preesgweene, like those in Wern, run on two fluids; the motor gets just the diesel. The exhaust, not the engine, is where AdBlue goes: sprayed into the fumes to clean them, from its own tank. Each tank has one filler of its own. Many of cars share a single flap for the two, while others move the AdBlue filler to your boot or under the bonnet. Diesel goes in at every filling station visit, week in, week out. Seldom topped up, AdBlue normally comes out of a bottle, tipped by someone who must stop and think what cap to use. The mistake grows in that gap between the two. ## How AdBlue in your diesel tank happens around Wern It is rarely carelessness. Three things tend to line up. On a driveway off Station Road before work, or in the car park at Butchers Arms on the way home: that is where the rushed top-up happens. Why the rush? As AdBlue gets low the vehicle tells you, and once it is empty, limp mode kicks in. Then the car is new. A hire car, a new car or a company car puts the fillers where your last one did not, and your hand reaches for the cap it would have used on the old one. Nothing stops the tip once 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 Weston Rhyn or the middle of Wern, it's the same few seconds. ## How to tell the AdBlue filler from the diesel one Check these first, at a forecourt in Wern or a drive over in Rhoswiel. Seconds, no more. - The cap. The AdBlue cap is frequently blue, or marked "AdBlue". Your diesel cap usually isn't. Read it rather than going by where it sits. - Plenty of vehicles fit AdBlue the smaller neck of the two. - Check inside the fuel flap: many vehicles carry a label there saying which fuel goes where. - The handbook. If your filler is not by the diesel cap, it is in the boot or under the bonnet, and the handbook says which. - Ask the person who drove it last — before you leave, not when the light comes on — if you collect a hire or company car from somewhere like the car park at Chirk. ## How to top up without AdBlue in your diesel tank The day the light comes on, anywhere in Shropshire, follow this routine. - Park then switch off. Not on a slope, not with your motor running, and not in a rush on the side of Brookfields. - Say "AdBlue" out loud as you unscrew the cap, after you find the AdBlue filler and reading it. Silly, perhaps, yet it does the trick. - The diesel cap remains on. When both share a flap, confirm it's shut before the bottle comes up. - Finish once that tank fills or the bottle is empty; until then, tip slowly through its built-in spout. - Close the cap and check a second time. Make sure the diesel cap was never opened. Only then start your car. If at step two or three you find you have already poured into your diesel side, stop there. Skip stage five altogether. ## Put AdBlue in the diesel tank in Wern already? Don't start the motor: that is how the short order of things begins. The fuel pump runs on many diesels as soon as the ignition is switched on — and so keep it off. AdBlue doesn't mix with diesel — it sinks to the bottom of your tank, where the fuel is pulled from — so don't top up with diesel to thin it. On a forecourt — Shell, BP or another — the staff will normally help push your car away, if you ask. Your own drive in Wern is where it should stay. When the engine has run by now, stop safely then turn it off. Come off the M53 — under 25 miles out of Wern — at the next exit. A short hop across Wern is a smaller job than a run towards Wrexham, under 15 miles away, and so tell us about how far it went. ## When our technicians turn up in Wern, what takes place? Anywhere the vehicle has stopped, be it by Weston Rhyn Primary School, near St John or on your own drive, the van comes to it. Our technicians ask what was put in, about how much, and if it's run, because those replies determine the work and our price. On the call itself, you hear our quote — before dispatch. Your system is then cleaned thoroughly, after your tank is drained. With AdBlue that matters more than with petrol: it crystallises and is corrosive to some of the metals in a fuel system, so it doesn't wash out on its own. After the filter has been cleaned — or renewed, where needed — clean diesel is added, and then the vehicle is tested. We don't go until it has been fired up and is running properly. Most jobs are done in roughly half an hour after we arrive, provided your engine has not run — and the pumps we use are fine on a busy forecourt yet quiet after dark beside a house. Payment is on the day, not upfront, and you are given the paperwork an insurer wants: an engineer report and a VAT invoice. Before we get there, take a look at your policy; many include cover for misfuelling. ## About Wern, for a moment Wern is a small village in Shropshire, situated on the riverside in the West Midlands region of England. Wern has a population of around 518 people and is characterized by predominantly detached housing. Wern is located near the villages of Weston Rhyn, Upper Hengoed, and Rhos, and is approximately 10 miles from the city of Wrexham. Wern sits at an elevation of 141 metres, with the nearest major city being Wrexham and London being around 158 miles away. ## Wern and Shropshire: AdBlue drains across the area Upper Hengoed and Rhos are among the towns around Wern, a village, that the same vans cover, over SY postcodes. Give a postcode beginning SY10 7, and the van gets there fastest. Your car doesn't need to shift. Anywhere it stands — near The Holroyd Community Theatre, in a layby heading to West Rhyn Recreation Ground, on a drive — that is where it is emptied. Ring and ask instead of assuming if you're close to a border, or somewhere hard to describe, like the back of St Mary the Virgin, Selattyn. ## The short version for Wern people Tip nothing until you've read the cap. Even so AdBlue in the diesel tank? Petrol in Diesel can drain it wherever it stands, anywhere in Shropshire: keep it off and phone 0333 366 0103.