--- title: AdBlue in a Diesel Tank Rhosllanerchrugog: Explained canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/rhosllanerchrugog-wrexham/ location: Rhosllanerchrugog county: Wrexham latitude: 53.011150 longitude: -3.052210 service: AdBlue in a Diesel Tank updated: 2026-10-23 --- # How It Happens and How to Avoid It: AdBlue in a Diesel Tank in Rhosllanerchrugog AdBlue already in your diesel tank? In that case set this page aside for now, leave your ignition and motor off, then phone 0333 366 0103. Normally, when the motor has not run, it's drained and thoroughly cleaned where the vehicle is around Rhosllanerchrugog. Reading in advance? In that case what follows covers why it happens and how to prevent it happening at all. ## AdBlue in a diesel motor: two tanks, two fillers Plenty of modern diesels on the roads round Rhosllanerchrugog and Johnstown carry two liquids, not one. Diesel goes to the engine. AdBlue's own tank keeps it, and from there it goes to your exhaust, and there spraying treats the gas. Each tank comes with one filler of its own. Under one flap, next to each other: that is the arrangement on many cars. Elsewhere, AdBlue's filler sits under the bonnet or in the boot instead. Diesel gets filled on each forecourt call-out, again and again. The AdBlue side is topped up far less commonly, normally from a bottle, and normally by a person who has to stop and think where it goes. It is in the gap that the mistake happens. ## How AdBlue in your diesel tank occurs in Rhosllanerchrugog It's hardly ever carelessness. Three things tend to line up. The warning comes first. As AdBlue runs low the car tells you, and if it runs out completely, the car goes into limp mode. So the top-up is done in a hurry: on a drive off Duke Street before work, or in the car park outside Horse & Jockey on the way home. The old car's cap is where your hand reaches — yet a hire car, a new car or a company car puts the fillers somewhere else. That's the second thing: a new car. 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. The same few seconds decide it, in the middle of Rhosllanerchrugog or out in Ponciau. ## How to tell the AdBlue filler from the diesel one Whether a Rhosllanerchrugog forecourt or a driveway out in Afon Eitha, spend a few seconds on these before anything is poured in. - Blue and marking: an AdBlue cap is frequently blue, or says "AdBlue", where a diesel cap usually doesn't. Trust the cap, not its position. - Look at the size: the smaller neck is, on plenty of vehicles, the AdBlue one. - A label inside your fuel flap frequently says which fuel goes where, on plenty of cars. Check for it. - The handbook says which it lives if your filler isn't next to your diesel cap: the boot, or under the bonnet. - The previous driver will know. Ask when you pick up a rental or company car — from Ruabon's car park, say — not once the warning comes on. ## How to top up without AdBlue in your diesel tank Wherever in Wrexham the light comes on, here is a routine for the day. - Park and switch off. Not on a slope, not with your motor running, and not in a rush on the side of Clarke Street. - Locate the AdBlue filler, check the cap, and speak the word "AdBlue" out loud as unscrewing it. It sounds silly. It works. - Both behind a single flap? So make sure the lid on your diesel side is still shut ahead of raising the bottle. - Gently does it, through the bottle's own spout, until it is full or the bottle runs out. - Shut the cap, then check again — confirm the diesel cap remained closed the whole time. Only then, start your car. Discover during the second or third stage that AdBlue went in the wrong tank? That is where you stop. Skip stage five altogether. ## Rhosllanerchrugog: already put AdBlue in your diesel tank? What follows is a short order of things, beginning with no starting your engine. On many diesels your ignition alone runs the fuel pump, so do not switch the vehicle on. Thinning it with extra diesel fails, because AdBlue sinks to the bottom rather than mixing — and that is where the fuel is sucked from. Ask the staff to help push the car away from the petrol pump if you are on a forecourt — the BP, the Esso or anywhere else. At home around Rhosllanerchrugog? So the car stays put. Where your motor has been run already, pull over somewhere safe and turn the car off. The next exit is the place to leave if you're on the M53, under 25 miles from Rhosllanerchrugog. Mileage matters — a quick hop across Rhosllanerchrugog makes a smaller job than driving under 5 miles to Wrexham — so say roughly how far it went. ## What takes place when our technicians arrive in Rhosllanerchrugog Our technicians come to the vehicle wherever it has stopped, whether that's outside the local primary school, near Gorsedd Stones or on your own driveway. The replies settle this work and our price, and so our technicians ask what was put in, about how much, and whether it has run. On the phone call itself, you hear the quote — ahead of dispatch. Then your tank is emptied and the system rinsed thoroughly. More than with petrol, it matters here: the crystals form, some metals are attacked, and none of it washes away unaided, no matter how long it is left. Filter flushed or, where needed, replaced; clean diesel in; and then a test of your car. The motor is fired up next and tested to confirm it runs smoothly, all before we go. Unrun vehicles usually mean a half-hour job from the moment we arrive. The kit is safe on a busy forecourt, and hushed enough for a driveway after dark. Paying is on the day, not upfront, and you are given the documents an insurer wants: an engineer's report and a VAT invoice. Wrong-fuel cover is included in many insurance policies — and so make use of the wait to look at yours. ## About Rhosllanerchrugog Rhosllanerchrugog is a locality situated in the county of Wrexham, approximately 3.5 miles from the city of Wrexham. Rhosllanerchrugog lies inland, with an elevation of around 156 metres, and is characterised by its predominantly detached housing. Rhosllanerchrugog is part of a wider area that includes nearby places such as Ponciau and Pant. ## AdBlue drains round Rhosllanerchrugog, and Wrexham beyond Rhosllanerchrugog is a small village, and the vans that cover it also work the places near it, Rhosllannerchrugog and Pant among them, across the LL postcode area. Our van gets to you fastest with a postcode starting LL14 1. The vehicle does not need to shift. A drive, a lay-by on the way to Ponciau Banks, a side street close to Rhos War Memorial: we drain it where it stands. Ring and ask instead of assuming if you are near a boundary, or somewhere hard to describe, like the back of Mount Pleasant English Baptist Chapel. ## In short, for Rhosllanerchrugog drivers Pour nothing till you have read the cap. Petrol in Diesel empties it where it stands, anywhere in Wrexham, if AdBlue has gone in the diesel tank all the same — so leave it off then call 0333 366 0103.