--- title: AdBlue in a Diesel Tank Lyneham: Explained canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/lyneham-wiltshire/ location: Lyneham county: Wiltshire latitude: 51.507100 longitude: -1.965590 service: AdBlue in a Diesel Tank updated: 2026-10-10 --- # How It Happens and How to Prevent It: AdBlue in a Diesel Tank in Lyneham Pause here for a moment when the diesel tank already holds AdBlue in it: ignition off, engine off, and ring 0333 366 0103. Caught before your engine runs, it's usually a drain and a thorough flush, done where your car is in Lyneham. If you are reading before it has happened, the rest of this page is about why it happens and how to make sure it does not. ## AdBlue in a diesel motor, and its separate tank Not one liquid but two: that's how plenty of modern diesels near Lyneham and New Zealand carry, with diesel for the motor. The exhaust, not your motor, is where AdBlue goes: sprayed into the fumes to fresh them, from its own tank. Every tank has one filler of its own. Many of vehicles share a single flap for both, whereas others put the AdBlue filler to the boot or under the bonnet. Diesel goes in on each forecourt call-out, again and again. A driver who has to stop and work out where it goes normally fills the AdBlue side, from a bottle, and far less commonly. That gap is where the error lives. ## How does AdBlue in the diesel tank occur in Lyneham? Three things tend to come together, and carelessness is seldom one of them. The warning comes first. As AdBlue runs low the car tells you, and if it runs out altogether, your vehicle drops into limp mode. So the top-up is done in a hurry: on a drive off Preston Lane before work, or in the car park outside The Mallard on the way home. The old car's filler is where the hand reaches — but a rental car, a new car or a company car keeps the fillers elsewhere. That's a second factor: an unfamiliar car. Lastly, the spout fits: a diesel filler or AdBlue one, it goes in as easily, and after the tip starts, nothing stops it. Church End or the middle of Lyneham: it is the same few seconds in both. ## How to tell the AdBlue filler from the diesel one Whether a Lyneham forecourt or a drive over in Littlecott, spend a few seconds on these before any is poured in. - Blue and marking: an AdBlue cap is regularly blue, or says "AdBlue", where a diesel cap normally does not. Go by the cap, not where it sits. - Many vehicles give AdBlue the smaller filler of the two. - The flap. Look inside the fuel flap for a label. Plenty of cars say there which fuel goes where. - The handbook. If the filler is not by your diesel cap, it is in your 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 pick up a hire or company car from somewhere like the car park outside Chippenham. ## AdBlue top-ups that never reach the diesel tank For the day the light comes on — anywhere it is in Wiltshire — a simple routine to use. - Turn off once parked — level ground, engine off, and never in a rush beside Calne Road on the verge. - Say "AdBlue" out loud as you unscrew the cap, once finding the AdBlue filler and read it. Silly, perhaps, but it works. - The diesel cap stays on. When the two sit under a flap, confirm it is shut before the bottle comes up. - Tip slowly, using the bottle's own spout. Stop when it is full or when the bottle is empty. - Before you start the vehicle, shut the cap and look again that the diesel cap was never came off. If at stage two or three you find you have already poured into the diesel side, stop there. Stage five is off limits. ## Lyneham: already put AdBlue in the diesel tank? Short order, then. First: the engine remains unstarted. On plenty of diesels your ignition alone runs the fuel pump, and so don't switch the vehicle on. Don't top up with diesel to dilute it: AdBlue doesn't mix with diesel, it sinks to the bottom of the tank, where the fuel is sucked from. At a forecourt — Esso, Tesco or any other — the attendants will usually help roll the car clear, when you ask. If you're on your own driveway in Lyneham, leave it where it is. Where your motor has been run already, stop safely and turn the vehicle off. The next exit is the place to leave when you're on the M4, under 3 miles from Lyneham. A short hop across Lyneham is a smaller job than a run towards Bath, under 25 miles away, so tell us about how far it went. ## Our arrival around Lyneham, and what takes place next Anywhere your car has stopped, whether outside Lyneham Primary School, near Lyneham Library or at home, the van comes to it. We ask what got in, about how much, and if it has run, because the answers settle the work and the price. You hear that price by phone, before anybody heads out. Emptying that tank comes next, then a thorough flush of the system. Much more than with petrol, it matters with AdBlue: the crystals build up, some metals corrode, and nothing clears out on its own, no matter how long it sits. Once the filter is cleaned — or replaced, where needed — fresh diesel is added, and finally your vehicle is tested. Next our engineers fire it up and make sure it runs smoothly before we go. Unstarted vehicles usually mean a half-hour job after the moment we arrive. The equipment is fine on a live forecourt, and hushed enough for a residential street late at night. Nothing in advance; you settle up on the day. At the end, the VAT invoice and the report from the engineer are handed to you for your insurer. It is worth checking your policy while we travel to you: misfuelling cover is included with plenty of policies. ## About Lyneham Lyneham is a village in north Wiltshire, situated inland at an elevation of around 129 metres, with semi-detached housing being the predominant type. Lyneham lies near the villages of Church End, Preston, and Tockenham, and is approximately 19 miles from the city of Bath. Lyneham has a population of around 3687 residents, and is located about 79 miles west of London. Lyneham remains a typical example of a rural Wiltshire community, with a mix of old and new buildings. ## AdBlue drains across Wiltshire, Lyneham included Preston and Tockenham are among the towns around Lyneham, a rural village, that the same vans cover, throughout SN postcodes. Quickest of all: quote a SN15 4 postcode for the van. Shifting your car is not needed. A driveway, a lay-by on the way to Lyneham Memorial Garden, a side street close to St. Michael and All Angels: our technicians drain it where it sits. If you're near a border, or somewhere hard to explain like the back of Woolwich Bell Tower, ring and ask rather than guessing. ## Lyneham people: the short version Before you pour, read the cap. If AdBlue has gone in your diesel tank all the same, leave it off and ring 0333 366 0103. Petrol in Diesel clears it where it stands, anywhere around Wiltshire.