--- title: AdBlue in a Diesel Tank Oldway: Explained canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/oldway-swansea/ location: Oldway county: Swansea latitude: 51.577560 longitude: -4.044150 service: AdBlue in a Diesel Tank updated: 2026-10-15 --- # AdBlue in a Diesel Tank in Oldway: Why It Occurs and How to Prevent It If AdBlue is already in your diesel tank, stop reading for a moment: leave the engine and your ignition off and ring 0333 366 0103. Around Oldway, catching it before your motor runs normally leaves a drain and a thorough flush on the spot. Reading in advance? In that case what follows explains why it comes about and what to stop it happening at all. ## AdBlue in a diesel car: two tanks, two fillers Many current diesels on the roads about Oldway and Manselfield carry two liquids, not one. Diesel goes to your engine. Its own tank holds it, and from there it is sent to your exhaust, where a spray treats the gas. Separate tanks, different fillers. Other cars keep the AdBlue filler in the boot or under the bonnet; plenty more place the two side by side behind one flap. At the pump, your diesel side is topped up all the time. Rarely topped up, AdBlue normally goes in out of a bottle, tipped by a driver who must stop and think what filler it needs. That gap is where the mistake lives. ## AdBlue in your diesel tank in Oldway: how it happens Carelessness rarely explains it. Instead is three things lining up at once. Hurry comes from the warning. The vehicle warns you as AdBlue runs low, and a dry tank puts the vehicle into limp mode — so the top-up gets done quickly, before work on a driveway off Kilfield Road, or heading home in the car park outside Plough & Harrow Murton. Then the vehicle is new. A hire car, a new motor or a company car puts the fillers where your last one did not, and the hand hits for the cap it would have used on the old one. 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 after it has started. Pyle or the middle of Oldway: it takes the same few seconds either way. ## The AdBlue filler and your diesel filler: telling them apart Before you tip anything, whether on a drive in Caswell or a forecourt around Oldway, check these. They take a couple of seconds. - Where it sits misleads; the cap doesn't. AdBlue caps tend to be blue or carry the word "AdBlue" — diesel ones usually do not. - Plenty of vehicles give AdBlue the smaller filler of the two. - Look inside your fuel flap: plenty of vehicles carry a label there showing which fuel goes where. - In your boot or under the bonnet: that's where the filler sits if it's not by your diesel cap, and the handbook says which. - Picking up a hire or company car, say at the car park outside Gowerton? Check with whoever drove it last before leaving, not once the light comes on. ## AdBlue top-ups that never reach your diesel tank Anywhere across Swansea the light comes on, this is a routine for that day. - Pull in on level, engine off, with time to spare — not rushing on the side of White Knight Gardens. - Find the AdBlue filler, read the cap, and say the name "AdBlue" out loud as you unscrew it. It seems silly. It does the trick. - Both behind one flap? Then make sure the cap on your diesel side stays shut ahead of lifting the bottle. - Using the bottle's own spout, pour slowly — and stop when it's full or the bottle is empty. - Before starting your car, close the cap and look a second time that the diesel cap never opened off. Stop there if you find, at step two or three, that you have already poured into your diesel side. Skip stage five altogether. ## Already put AdBlue in the diesel tank around Oldway? Short list, then. Top of it: your motor stays off. Do not switch your ignition on; on plenty of diesels that alone runs the fuel pump. Topping up with diesel won't weaken it: instead, AdBlue sinks to the base of that tank, right where the fuel is drawn from. Ask the attendants to help roll the car away from the pump if you're at a forecourt — the the nearest petrol station, the Newton Garage or somewhere else. At home in Oldway? So the car remains put. When the motor has been run already, stop safely then turn it off. Leave the M4 — under 10 miles out of Oldway — at the next exit. Tell us roughly how far it went: a run towards Swansea, under 10 miles away, is a bigger job than a short hop across Oldway. ## What occurs when our engineers turn up around Oldway The van reaches your car anywhere it stopped — your own driveway, beside Murton Methodist Church, or by the local primary school. Both the work and the quote rest on three replies — what fluid, what amount, and if it has run — so we ask. During the phone call itself, you hear our price — before dispatch. Then your tank is cleared and the system rinsed thoroughly. More than with petrol, it counts with AdBlue: the crystals build up, some metals are attacked, and none of that washes away unaided, however long it is left. Your filter is flushed, or replaced where it needs to be; clean diesel goes in; and the vehicle is tested. We don't leave until it has been started and is running correctly. Using pumps fine on a busy forecourt and quiet enough for use outside a house at night, most jobs in which the motor hasn't run take about half an hour once we are there. Payment happens on the day, not upfront, and you are given the paperwork your insurer wants: an engineer's report and a VAT invoice. Wrong-fuel cover is included in many insurance policies — so make use of the wait to check yours. ## About Oldway and where it is Oldway is a suburban area located on the coast of Swansea, sitting at an elevation of 78 metres and approximately 5.3 miles from the city centre. Oldway is characterized by its predominantly detached housing stock, reflecting the area's residential development. Oldway is situated near other local places such as Pyle, Bishopston, and Murton, and is home to a population of around 1916 residents. Oldway benefits from its proximity to Swansea, while also being within a larger coastal context. ## Oldway and Swansea: AdBlue drains across the area Oldway is a residential suburb, and the teams that cover it also work the towns near it, Bishopston and Murton among them, across the SA postcode area. The van reaches you fastest with a postcode starting SA3 3. No need to move the vehicle. Anywhere it stands — near St. Peter's Well, in a lay-by heading to Mansel Green, at home — that is where it is drained. Ring and ask rather than guessing if you are close to a border, or somewhere hard to describe, like the back of Murton Methodist Church Hall. ## For Oldway drivers, the short version Tip no AdBlue until you've read the cap. Petrol in Diesel empties it on the spot, anywhere across Swansea, if AdBlue has gone in the diesel tank all the same — so leave the car off and ring 0333 366 0103.