--- title: Explained: AdBlue in a Diesel Tank Tadmarton canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/tadmarton-oxfordshire/ location: Tadmarton county: Oxfordshire latitude: 52.037620 longitude: -1.428570 service: AdBlue in a Diesel Tank updated: 2026-10-15 --- # Why It Occurs and How to Avoid It: AdBlue in a Diesel Tank in Tadmarton AdBlue already in the diesel tank? In that case set this page aside for now, leave your ignition and motor off, then call 0333 366 0103. Caught before your engine runs, it's normally a drain and a thorough flush, done where the vehicle is in Tadmarton. If you are reading before it has happened, the remainder of this page is about why it takes place and how to make sure it doesn't. ## AdBlue in a diesel motor, and its separate tank Not one liquid but two: that's what many modern diesels near Tadmarton and Shutford run, with diesel for your engine. Its own tank holds it, and from there it is sent to the exhaust, where spraying treats the fumes. Every tank comes with a filler of its own. Other vehicles put the AdBlue filler in the boot or under the bonnet; a lot of others place the two side by side behind one flap. At the pump, your diesel side is topped up all the time. Much less commonly, the AdBlue side gets topped up — mostly from a bottle, by a person thinking about where it goes. The mistake grows in the gap between them. ## Tadmarton: how AdBlue in the diesel tank occurs Three things tend to come together, and carelessness is rarely one of them. On a drive off Bakers Lane before work, or in the car park outside Lampet Arms on the way home: that is where the rushed top-up takes place. Why the rush? As AdBlue runs low the vehicle tells you, and once it's gone, limp mode kicks in. Then, your hand reaches for the cap it knew on the old car — since a hire car, a new vehicle or a company car puts the fillers somewhere your last one didn't. 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. The same few seconds decide it, in the middle of Tadmarton or out in Lower Tadmarton. ## How to tell the AdBlue filler from the diesel one A couple of seconds is all these take — so check them before you pour anything, on a driveway in Wigginton Heath or a forecourt in Tadmarton. - Check the cap instead of going by where it sits: AdBlue caps are regularly blue or marked "AdBlue", and diesel caps normally aren't. - Many motors fit AdBlue the smaller filler of the two. - Open the filler flap and check for a label — plenty of vehicles mark what goes in which inlet right there. - The handbook. If the filler isn't by the diesel cap, it's in your boot or under the bonnet, and the handbook says which. - The person who drove the vehicle last. On a hire or company car picked up from somewhere like the car park outside Banbury, ask before you leave, not when the light comes on. ## Topping up AdBlue without it reaching your diesel tank A routine for the day the light comes on, wherever across Oxfordshire that is. - Stop on level, motor off, with time to spare — not rushing on the side of Main Street. - Daft as it sounds, saying "AdBlue" out loud while you unscrew the cap works — after you have found your filler and read the cap. - Leave the diesel cap on. If both sit under one flap, check your diesel cap is still closed before you lift the bottle. - Tip slowly, using the bottle's own spout. Stop when it's full or when the bottle is empty. - Close the cap and check a second time. Make sure your diesel cap was never opened. Only then start the vehicle. Discover at the second or third step that the bottle went into the diesel tank? That's where you stop. Skip stage five altogether. ## Already put AdBlue in the diesel tank in Tadmarton? What follows is a short order of things, starting with no starting your motor. The fuel pump runs on plenty of diesels as soon as your ignition goes on — and so leave it off. AdBlue does not mix with diesel — it sinks to the bottom of the tank, where your fuel is sucked from — so don't top up with diesel to dilute it. If you are on a forecourt, whether it's the BP or the Texaco, ask the staff to help roll your car clear of the pump. Your own drive in Tadmarton is where it stays. Where the motor has run already, stop safely then turn it off. Tadmarton sits under 10 miles from the M40; there, use the next exit. Roughly how far did it go? Hopping across Tadmarton is smaller a job than a trip of under 25 miles towards Oxford, and so tell us. ## When our engineers get there around Tadmarton, what takes place? Outside Bishop Carpenter Church of England Primary School, close to Saint Nicholas or on your own driveway: wherever the vehicle has stopped, our engineers come to it. What liquid went in, the amount, and whether it ran: we ask since the answers decide both work and price. You hear that price on the phone, before anyone heads out. Then that tank is drained and the fuel system rinsed thoroughly. More than with petrol, it counts here: the crystals build up, some metals are attacked, and none of that washes away on its own, no matter how long it is left. The fuel filter is cleaned, or replaced where it needs to be; clean diesel goes in; and your car is tested. Before we leave, our engineers start it and confirm that it's running properly. Unrun vehicles mostly mean a half-hour job from the moment we arrive. The kit is safe on a busy filling station, and quiet enough for a driveway after dark. Your insurer will ask for an engineer's report and the VAT invoice, and you get both at the end. Payment is on the day, with no money upfront. It's worth checking your policy as the van travels to you: misfuelling cover is included with many policies. ## About Tadmarton itself Tadmarton is a small village in Oxfordshire, situated in a rural area with a mix of arable land and woodland. Tadmarton sits at an elevation of around 135 metres, approximately 21 miles north of Oxford and 66 miles west of London. Tadmarton has a population of around 520 people, predominantly living in detached houses, and is close to nearby places such as Lower Tadmarton and Swalcliffe. ## AdBlue drains across Oxfordshire, Tadmarton included Tadmarton is a rural village, and our vans that cover it also work the towns near it, High Meadow View and Swalcliffe among them, across the OX postcode area. The van reaches you fastest with a postcode starting OX15 5. Shifting the car isn't needed. Our engineers drain it where it is — a side street near Swalcliffe Village Hall, a lay-by on the way to Heathell Spinney, a drive. Ring and ask rather than assuming if you're near a border, or somewhere hard to describe, like the back of Saint Peter and Saint Paul. ## In short, for Tadmarton people Read the cap before you tip. If AdBlue has gone in your diesel tank all the same, leave the car off then call 0333 366 0103. Petrol in Diesel clears it where it stands, anywhere across Oxfordshire.