--- title: AdBlue in a Diesel Tank Five Locks: Explained canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/five-locks-torfaen/ location: Five Locks county: Torfaen latitude: 51.665880 longitude: -3.039470 service: AdBlue in a Diesel Tank updated: 2026-10-26 --- # Why It Occurs and How to Prevent It: AdBlue in a Diesel Tank in Five Locks Stop reading a minute if the diesel tank already holds AdBlue in it: ignition off, motor off, and ring 0333 366 0103. Caught before your motor runs, it's normally a drain and a thorough flush, done where the vehicle is around Five Locks. If you are reading before it has happened, the rest of this page is about why it happens and how to make sure it doesn't. ## AdBlue in a diesel car, and its separate tank Plenty of modern diesels around Pontrhydyrun, as well as Five Locks, carry on two fluids; the motor gets just your diesel. Kept in a tank of its own, AdBlue is fed into your exhaust stream to clean it. Different tanks, different fillers. Under one flap, next to each other: that's the arrangement on many cars. Elsewhere, AdBlue's filler sits under the bonnet or in the boot instead. Topping up your diesel side at the pump happens all the time. Seldom filled, AdBlue normally comes from a bottle, poured by a driver who has to stop and think what cap it needs. That gap is where the slip lives. ## Five Locks: how AdBlue in the diesel tank occurs Carelessness seldom explains it. What does is three things lining up at once. To start with, the warning. Low AdBlue brings a message from the vehicle, and running dry leads to limp mode — so a hurried top-up, perhaps before work off Ty Pwca Place, or outside The Queen Inn on the way home after work. Next, the hand goes for the cap it would have used on the old vehicle — since a rental car, a new motor or a company car places the fillers where your last one did not. A spouted bottle finds no resistance at a diesel filler any more than at an AdBlue one. And so the tip, once started, carries on. The same few seconds settle it, in the middle of Five Locks or out in Lowlands. ## How to tell the AdBlue filler from the diesel one Be it a Five Locks forecourt or a drive out in Thornhill, take a couple of seconds over these before anything is poured in. - Colour and marking: an AdBlue cap is frequently blue, or says "AdBlue", where a diesel cap normally doesn't. Trust the cap, not its position. - Plenty of cars fit AdBlue the smaller filler of the two. - A label inside the fuel flap frequently shows which fuel goes where, on many cars. Check for it. - The handbook shows which it lives if the filler is not next to your diesel cap: your boot, or under the bonnet. - Whoever had it before knows. Check when you pick up a hire car or fleet car — at Cwmbran's car park, say — not when the warning comes on. ## How to top up without AdBlue in the diesel tank On the day the light appears — anywhere you are in Torfaen — a routine to use. - Pull in on level, engine off, with time to spare — not hurried on the side of Upper Cwmbran Road. - Find the AdBlue filler and read the cap. Say "AdBlue" out loud as you unscrew it. It sounds daft and it does the trick. - The diesel cap remains on. Where the two share a flap, make sure it is closed before the bottle comes up. - Tip slowly, using the bottle's own spout. Stop when it's full or when the bottle is empty. - Before starting the vehicle, close the cap and look a second time that the diesel cap never came off. If at step two or three you find you have already poured into your diesel side, stop there. Never go on to stage five. ## Put AdBlue in your diesel tank around Five Locks already? Brief order, then. Top of it: your motor remains off. On plenty of diesels the ignition alone runs the fuel pump, and so do not switch it on. Topping up with diesel will not thin it: instead, AdBlue drops to the base of that tank, right where the fuel is taken from. Ask the staff to help push the vehicle clear of the petrol pump if you are at a forecourt — the Colley Motor Group, the Texaco or anywhere else. At home in Five Locks? So the car remains where it is. If your motor has already run, stop as soon as it is safe and switch off. Five Locks lies under 5 miles from the M4; on it, use the next exit. Tell us about how far it went: a run towards Newport, under 10 miles away, is a bigger job than a short hop across Five Locks. ## Five Locks: what happens when we get there The van comes to the vehicle wherever it stopped — your own drive, near Greenmeadow Community Farm, or by the local primary school. Those answers decide this work and the price, and so our technicians ask what got in, about how much, and if it's run. On the phone call itself, you hear our price — ahead of dispatch. Next: a drain, then a thorough flush of the entire system. More than with petrol, it matters here: crystals build up, some metals are attacked, and none of that washes away unaided, no matter how long it is left. The fuel filter is cleaned, or replaced where it needs to be; fresh diesel goes in; and the vehicle is tested. After that our engineers fire it up and check it runs correctly before leaving. If your motor hasn't run, most jobs take about half an hour once we are there, using pumps that are fine on a busy forecourt and quiet enough to use outside a house at night. The insurer usually wants an engineer's report and the VAT invoice, and you get both at the end. Payment is on the day, with no deposit. Wrong-fuel cover is part of plenty of insurance policies — and so use the wait to look at yours. ## About Five Locks, for a moment Five Locks is a suburban area situated on the riverside in Torfaen, Wales, with a mix of terraced housing and local amenities. Five Locks sits near the city of Newport, approximately 5.7 miles away, and is close to nearby places such as Lowlands and Upper Cwmbran. Five Locks has a population of around 4176 people and is located at an elevation of 128 metres. Five Locks is part of the wider urban area surrounding Newport, with easy access to the city and its facilities. ## AdBlue drains in Five Locks and across Torfaen Five Locks is a residential suburb, and the teams that cover it also work the towns around it, Upper Cwmbran and West Pontnewydd among them, across the NP postcode area. The van reaches you fastest with a postcode starting NP44 1. Shifting the vehicle isn't necessary. Anywhere it sits — near St David's RC Church, in a layby heading to Pontnewydd Golf Course, on a drive — that's where it gets emptied. Tricky to explain, like the back of Ebenezer Evangelical Church? By a border? Checking beats assuming, and so phone. ## In short, for Five Locks people Tip no AdBlue until you have read the cap. If AdBlue has gone in the diesel tank all the same, leave the vehicle off then ring 0333 366 0103. Petrol in Diesel empties it where it sits, anywhere across Torfaen.