--- title: Slade Green: AdBlue in a Diesel Tank, Explained canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/slade-green-greater-london/ location: Slade Green county: Greater London latitude: 51.470340 longitude: 0.190080 service: AdBlue in a Diesel Tank updated: 2026-10-04 --- # How It Happens and How to Prevent It: AdBlue in a Diesel Tank in Slade Green AdBlue already in the diesel tank? In that case set this page down for now, leave the ignition and motor off, and phone 0333 366 0103. Normally, when the motor hasn't run, it's drained and thoroughly purged where your car sits in Slade Green. If you're reading before it has happened, the rest of this page is about why it takes place and how to make sure it does not. ## Two fillers, two tanks: AdBlue in a diesel motor No single fluid but two: that is how plenty of newer diesels near Slade Green and Barnes Cray run, with diesel feeding your engine. Its own tank keeps it, and from there it goes to the exhaust, where a spray treats the gas. Different tanks, different fillers. Some vehicles put the AdBlue filler in the boot or under the bonnet; plenty of others have the two side by side under one flap. At the petrol pump, your diesel side is topped up constantly. Rarely topped up, AdBlue normally goes in out of a bottle, poured by someone who has to stop and think which cap to use. It is in that gap that the error lives. ## How does AdBlue in the diesel tank happen around Slade Green? Carelessness rarely explains it. Instead is three things lining up together. To start with, the warning. Low AdBlue brings a message from your car, and letting it run dry leads to limp mode — hence a rushed top-up, perhaps before work off Bridge Road, perhaps at The Corner Pin on the way home after work. Then the vehicle is unfamiliar. A hire car, a new car or a company car puts the fillers where your last one did not, and your hand gets to for the cap it would have used on the old one. Nothing stops the tip once it has started, because a bottle with a spout goes into a diesel filler as easily as an AdBlue one. The bottle fits. It takes a few seconds, be it in North End or bang in the heart of Slade Green. ## Telling the AdBlue filler from your diesel filler A few seconds is all the checks take — so check them before you pour anything, on a driveway in Dartford Marshes or a forecourt around Slade Green. - The cap. The AdBlue cap is commonly blue, or marked "AdBlue". The diesel cap usually is not. Read it rather than going by where it sits. - On plenty of vehicles, the size tells: AdBlue gets the smaller filler neck. - The flap. Look inside the fuel flap for a label. Plenty of cars say there which fuel goes where. - In your boot or under the bonnet: that is where the filler sits if it is not by the diesel cap, and the handbook says which. - Whoever had it before knows. Check when you pick up a rental or company car — at the nearest station's car park, perhaps — rather than once the warning comes on. ## AdBlue top-ups that never reach the diesel tank A routine for the day the light comes on, wherever across Greater London that is. - Not in a rush on the side of Plantation Road, not on a slope, not with your engine running: park and switch off properly. - 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. - Tip slowly, using the bottle's own spout. Stop when it is full or when the bottle is empty. - Close the cap, and look once more — making sure the diesel cap stayed shut throughout. After that, start your car. Discover at the second or third step that the bottle went into the wrong tank? That's where you stop. Never carry on to step five. ## Slade Green: already put AdBlue in the diesel tank? What follows is a short order of things, beginning with not starting your motor. Keep your ignition off as well, since on many diesels switching it on by itself starts your fuel pump. Diluting it with more diesel fails, since AdBlue settles to the bottom instead of blending — and that's where the fuel is sucked from. If you're on a forecourt, whether it's the Shell or the Morrisons, ask the staff to help roll the vehicle clear of the pump. Leave it where it is if you're on your own driveway in Slade Green. If your engine has already run, stop as soon as it is safe and switch off. On the M25, under 5 miles from Slade Green, that means the next junction. Tell us about how far it went: a run towards London, under 15 miles away, is a bigger job than a short hop across Slade Green. ## What takes place when we get there in Slade Green The van reaches the car anywhere it stopped — your own driveway, near St Augustine of Canterbury, or outside St. Paul's (Slade Green) Church of England Primary School. Which liquid went in, the amount, and whether it ran: our technicians ask since those replies decide the work and price. You hear that quote on the phone, before anybody sets off. Draining your tank comes next, then a thorough flush of your system. With AdBlue that counts more than with petrol: it crystallises and is corrosive to some of the metals in a fuel system, so it doesn't wash out on its own. A test is last: before that, clean diesel is added, and your filter is flushed or replaced as needed. We do not leave until it has been fired up and is running properly. With pumps fine on a working forecourt and quiet enough for use outside a house at night, most jobs in which the motor has not run take roughly half an hour once we are there. Paying is on the day, not upfront, and you are given the documents an insurer asks for: an engineer report and a VAT invoice. Wrong-fuel cover is included in many insurance policies — and so make use of the wait to look at yours. ## About Slade Green and where it is Slade Green is a suburban area in south-east London, situated near the River Thames and approximately 13.9 miles from central London. Slade Green has a relatively low elevation of around 6 metres above sea level and is surrounded by other suburban areas such as North End and Colyers. Slade Green is characterised by its predominantly semi-detached housing stock, which reflects the typical residential development of the region. Slade Green is also close to the town of Erith, which provides local amenities and services. ## Slade Green and Greater London: AdBlue drains across the area Throughout DA postcodes, our teams covering Slade Green — a residential suburb — work the nearby spots too, Erith and Colyers among them. The van gets to you fastest with a postcode starting DA8 2. Your car doesn't need to shift. A driveway, a lay-by on the way to Howbury Lane Open Space, a side street near Northend Baptist Church: we drain the vehicle where it sits. Guessing won't help behind Erith Marshes Heavy Anti-Aircraft Battery, on a boundary, or anywhere awkward to describe; ring and check. ## Slade Green people: the short version Before you pour, read the cap. If AdBlue has gone in your diesel tank anyway, leave it off and call 0333 366 0103. Petrol in Diesel empties it where it waits, anywhere around Greater London.