--- title: AdBlue in a Diesel Tank Esher: Explained canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/esher-surrey/ location: Esher county: Surrey latitude: 51.369420 longitude: -0.365700 service: AdBlue in a Diesel Tank updated: 2026-10-01 --- # Esher: How Does AdBlue End Up in a Diesel Tank, and How Do You Avoid It? AdBlue already in your diesel tank? In that case set this page down a moment, leave your ignition and engine off, then phone 0333 366 0103. Caught before your engine runs, it's generally a drain and a thorough flush, done where the car is around Esher. Here before the event? In that case what follows explains how it comes about and how to prevent it happening at all. ## AdBlue in a diesel motor, and its separate tank Plenty of newer diesels in Hinchley Wood, as well as Esher, carry on two fluids; the engine takes just the diesel. Kept in a tank of its own, AdBlue is sprayed into the exhaust stream to clean it. Each tank has its own filler. Many of motors have a single flap for both, while others put the AdBlue filler to your boot or under the bonnet. Diesel gets filled on each filling station visit, week in, week out. Seldom filled, AdBlue usually goes in out of a bottle, poured by someone who must stop and think which filler it needs. It is in the gap that the mistake lives. ## How does AdBlue in your diesel tank occur around Esher? Carelessness seldom causes it. Instead is three things lining up at once. The warning comes first. As AdBlue runs low your car tells you, and if it runs out altogether, the vehicle goes into limp mode. So the top-up is done in a hurry: on a drive off Church Street before work, or in the car park at The Bear on the way home. Unfamiliar motors come second, as well. Rentals, new motors and company motors put their fillers differently, and habit reaches for the cap used on the old one. No part stops the pour once it has started, since a bottle with a spout goes into a diesel filler as easily as an AdBlue one. The bottle fits. Lower Green or the heart of Esher: it is the same few seconds in both. ## How to tell the AdBlue filler from the diesel one A few seconds is all these take — so run through them before you pour anything, on a driveway in Claygate or a forecourt around Esher. - Blue and marking: an AdBlue cap is frequently blue, or says "AdBlue", where a diesel cap normally does not. Go by the cap, not its position. - Plenty of motors give AdBlue the smaller neck of the two. - Look inside the fuel flap: many vehicles carry a label there showing which fuel goes where. - In your boot or under the bonnet: that is where your filler sits if it's not by the diesel cap, and the handbook tells you which. - Ask the person who drove it last — before you leave, not when the light comes on — when you pick up a hire or company car from somewhere like the car park at the nearest station. ## How to top up without AdBlue in the diesel tank For the day the light comes on — anywhere you are across Surrey — a simple routine to follow. - Pull in on level, engine off, with time to spare — never hurried on the side of Claremont Lane. - Say "AdBlue" out loud as you unscrew the cap, after you find the AdBlue filler and read it. Daft, yes, but it works. - The diesel cap remains on. When the two sit under a flap, make sure it's shut before lifting the bottle. - Tip slowly, using the bottle's own spout. Stop when it's full or when the bottle is empty. - Shut the cap, then look once more — making sure your diesel filler remained closed throughout. Only then, start the vehicle. If at step two or three you find you have already poured into your diesel side, stop there. Never carry on to step five. ## AdBlue in your diesel tank already, around Esher? Do not start your engine: that is how the short order of things begins. On many diesels the ignition alone runs the fuel pump, so don't switch the vehicle on. Filling up with diesel will not weaken it: rather than mixing, AdBlue sinks to the bottom of that tank, right where fuel is drawn from. Ask the attendants to help roll your car clear of the pump if you are at a forecourt — the Shell, the Texaco or anywhere else. Leave it where it is if you're on your own driveway in Esher. If your engine has already run, stop as soon as it is safe and switch off. On the M25, under 5 miles from Esher, that means the next exit. Tell us roughly how far it went: a run towards Westminster, under 15 miles away, is a bigger job than a short hop across Esher. ## What happens when our technicians arrive in Esher Wherever the car came to rest, whether outside Esher Church School, beside Francis John Williamson or at home, our van travels to it. What liquid got in, the quantity, and whether it ran: our engineers ask since those answers decide both work and quote. The quote is given on the call, ahead of any van leaving. Emptying your tank comes next, followed by a thorough flush of the system. Not like petrol, AdBlue forms crystals and eats at some fuel-system metals, and neither clears out by itself. Hence it counts more. A test comes at the end: before that, fresh diesel is added, and the fuel filter is cleaned or changed if necessary. Before we go, our technicians start the engine and confirm that it is running smoothly. Unrun cars mostly mean a half-hour visit from the moment we arrive. The kit is fine on a live forecourt, and hushed enough for a residential street late at night. Your insurer will ask for an engineer's report and the VAT invoice, and both are yours once the job is done. Payment comes on the day, with no money upfront. Many insurance policies include misfuelling cover, so it is worth checking yours whilst we are on the way. ## About Esher itself Esher is a town in Surrey, situated inland at an elevation of around 40 metres, approximately 14 miles from London. Esher has a mix of housing types, but is predominantly characterised by detached homes. Esher is close to several nearby places, including Lower Green, Claremont Park, and West End, and is part of the commuter belt around the capital. Esher has a population of around 8811 people. ## AdBlue drains across Surrey, Esher included Claremont Park and West End are among the towns near Esher, a town, that the same vans cover, over KT postcodes. Give a postcode beginning KT10 9, and the van arrives quickest. The car doesn't need to move. The drain happens on the spot, be it a drive, a street by St George's Church, or a layby towards Esher Green. Guessing won't help at the back of Christ Church, on a boundary, or somewhere awkward to describe; phone and ask. ## The short version for Esher drivers Read the cap before you tip. AdBlue in the diesel tank regardless? Leave the vehicle off then phone 0333 366 0103; Petrol in Diesel empties it on the spot, throughout Surrey.