--- title: AdBlue in a Diesel Tank Aston? Read This canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/aston-oxfordshire/ location: Aston county: Oxfordshire latitude: 51.724800 longitude: -1.508140 service: AdBlue in a Diesel Tank updated: 2026-10-06 --- # Aston: How Does AdBlue End Up in a Diesel Tank, and How Do You Avoid It? If AdBlue is already in your diesel tank, stop reading for a moment: leave the motor and your ignition off then ring 0333 366 0103. Caught before your motor runs, it is generally a drain and a thorough flush, done where your car is in Aston. The rest of this page covers why it happens and how to make sure it doesn't — handy if you're reading before it has happened. ## Why does AdBlue in a diesel vehicle need its own filler? Diesel feeds your motor — yet many newer diesels seen round Aston and Chimney carry a second fluid too. AdBlue goes to your exhaust, where it is sprayed into the gas to fresh it, and it lives in a tank of its own. Separate tanks, different fillers. Plenty of vehicles share a single flap for the two, whereas some move the AdBlue filler to the boot or under the bonnet. Filling your diesel side at the pump goes on constantly. The AdBlue side is topped up far less often, usually from a bottle, and usually by someone who has to stop and think where it goes. The mistake grows in the gap between them. ## How AdBlue in the diesel tank takes place in Aston It's seldom carelessness. Three things tend to line up. On a drive off West End before work, or in the car park outside Red Lion on the way home: that is where the hurried top-up happens. Why the rush? As AdBlue runs low the car warns you, and if it's gone, limp mode follows. The old car's filler is where your hand goes — but a rental car, a new motor or a company car keeps the fillers elsewhere. That is a second factor: a new vehicle. Third, the spout goes in: diesel filler or AdBlue one, it goes in just as readily, and after the tip starts, no part stops it. Cote or the heart of Aston: it is the same few seconds in both. ## Which filler is for AdBlue, and which for diesel? Be it a Aston forecourt or a driveway out in Weald, take a few seconds on these before anything goes in. - Blue and lettering: an AdBlue cap is frequently blue, or says "AdBlue", where a diesel cap normally doesn't. Go by the cap, not its position. - Many motors fit AdBlue the smaller neck of the two. - A label inside the fuel flap often shows which fuel goes where, on plenty of vehicles. Check for it. - Cannot see it beside your diesel filler? In that case look beneath the bonnet or inside your boot — the owner's manual will say where. - 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 Combe. ## Keeping AdBlue out of your diesel tank when you top up Wherever across Oxfordshire the light comes on, this is a routine for that day. - Park then switch off. Not on a slope, not with the motor running, and not in a rush on the side of North Street. - Find the AdBlue filler and read the cap. Say "AdBlue" out loud as you unscrew it. It sounds daft and it works. - Leave the diesel cap on. If both sit under one flap, check your diesel cap is still closed before you lift the bottle. - Gently does it, through the bottle's own spout, until it's full or the bottle runs out. - Only then, start the car: close the cap, check again, and make sure your diesel cap was never opened. Stop there if you find, at stage two or three, that you have already poured into your diesel side. Don't go on to stage five. ## Put AdBlue in your diesel tank in Aston already? Don't start your engine: that's how the short order of things starts. The fuel pump runs on many diesels the moment the ignition goes on — so leave it off. Filling up with diesel will not dilute it: rather than mixing, AdBlue drops to the base of that tank, right where the fuel is drawn from. If you are on a forecourt, whether it is the Pace or the BP, ask the staff to help roll the vehicle away from the pump. If you are on your own drive in Aston, leave the vehicle where it is. When the engine has been run by now, pull over somewhere safe then switch the vehicle off. The next exit is the place to come off if you're on the M4, under 25 miles from Aston. A short hop across Aston is a smaller job than a run towards Oxford, under 15 miles away, and so tell us about how far it went. ## When we turn up around Aston, what occurs? The van comes to the car anywhere it has come to rest — your own driveway, near Saint James, or outside Aston and Cote Church of England Primary School. What liquid went in, the quantity, and whether it ran: our technicians ask since the answers set the work and price. During the phone call itself, you hear our price — before dispatch. The fuel system is then cleaned thoroughly, after your tank is emptied. AdBlue crystallises and is corrosive to some of the metals in a fuel system, so it doesn't wash out on its own — which is why the flush matters more with AdBlue than with petrol. Filter flushed or, if it must be, replaced; clean diesel in; and then a check of the car. Your engine is fired up next and checked to be sure it runs properly, all before we head off. Most jobs are finished in about half an hour after our engineers get there, provided the engine hasn't run — and the pumps our technicians use are safe on a busy forecourt yet quiet after dark outside a house. Your insurer usually wants the engineer's report and your VAT invoice, and you get both at the end. Payment comes on the day, with no deposit. It's worth looking at your insurance as the van travels to you: misfuelling cover comes with plenty of policies. ## About Aston and where it is Aston is a village in Oxfordshire, situated on the River Thames at an elevation of 73 metres. Aston sits near the towns of Cote, Yelford, and Bampton, and is located approximately 10.9 miles from Oxford. Aston has a population of around 1174 people, predominantly living in detached houses. Aston is also within commuting distance of London, being around 61.1 miles away. ## Aston and Oxfordshire: AdBlue drains across the area Over OX postcodes, our teams covering Aston — a village — work the surrounding spots too, Bampton and Yelford included. Our van reaches you fastest with a postcode starting OX18 2. Your car stays where it is. Our technicians drain it where it is — a side street close to Aston and Cote Village Hall, a lay-by on the way to Bampton Recreation Ground, a driveway. Assuming doesn't help at the back of Cote Baptist Chapel, close to a border, or somewhere hard to pin down; phone and check. ## In short, for Aston motorists First, the cap; after that, the pour. AdBlue in your diesel tank after all? Leave the vehicle off and call 0333 366 0103; Petrol in Diesel empties it on the spot, across Oxfordshire.