--- title: Southfields: AdBlue in a Diesel Tank, Explained canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/southfields-leicestershire/ location: Southfields county: Leicestershire latitude: 52.628200 longitude: -1.125460 service: AdBlue in a Diesel Tank updated: 2026-10-06 --- # Southfields: How Does AdBlue End Up in a Diesel Tank, and How Do You Avoid It? Keep the engine and ignition off and call 0333 366 0103 now — reading can wait when AdBlue is already in the diesel tank. Normally, when the engine hasn't turned, it's drained and thoroughly cleaned where your car is in Southfields. The remainder of this page covers why it occurs and how to make sure it does not — handy if you are reading ahead of time. ## Why does AdBlue in a diesel motor need its own filler? Plenty of modern diesels on the roads about Southfields and Spinney Hills carry two liquids, not one. Diesel goes to the engine. Stored in a tank of its own, AdBlue is fed into your exhaust gas to clean it. Every tank has a filler of its own. Some cars keep the AdBlue filler in the boot or under the bonnet; plenty of others place the two side by side under one flap. Diesel goes in on every forecourt visit, week in, week out. Rarely topped up, AdBlue usually comes from a bottle, poured by a driver who has to stop and think what filler it needs. It's in the gap that the slip happens. ## Southfields: how AdBlue in your diesel tank happens Rarely is it carelessness: usually three things coincide. Hurry follows from the warning. The vehicle warns you as AdBlue runs low, and an empty tank puts it into limp mode — so the top-up gets done in a rush, before work on a drive off De Montfort Square, or heading home in the car park at The Hind. Next, the hand reaches for the cap it would have used on the old vehicle — because a hire car, a new car or a company car puts the fillers where your last one did not. Nothing stops the pour after it has started, because a bottle with a spout goes into a diesel filler as readily as an AdBlue one. The bottle fits. Highfields or the middle of Southfields: it is the same few seconds in both. ## How to tell the AdBlue filler from the diesel one Check these first, on a forecourt in Southfields or a driveway over in Black Friars. Seconds, that's all. - Position misleads; the cap does not. AdBlue caps tend to be blue or bear the word "AdBlue" — diesel caps usually don't. - Many cars give AdBlue the smaller neck of the two. - Lift the filler flap and look for a label — plenty of cars mark what belongs in each filler just there. - The handbook says which it is if your filler is not next to your diesel cap: the boot, or under the bonnet. - 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 Leicester. ## Keeping AdBlue out of the diesel tank when you top up A routine for the day the light comes on, wherever in Leicestershire that is. - Not in a rush on the side of Princess Road East, not on a slope, not with the engine running: park and switch off properly. - Daft as it sounds, saying "AdBlue" aloud as you unscrew the cap works — after you've found the filler and read the cap. - The two behind one flap? Then make sure the lid on the diesel side stays shut ahead of raising the bottle. - Stop when that tank is topped up or the bottle is empty; until then, pour gently through the built-in spout. - Before starting your car, close the cap and check a second time that the diesel cap was never opened off. Discover at the second or third step that the bottle went into the diesel tank? That is where you stop. Never go on to stage five. ## Put AdBlue in the diesel tank around Southfields already? What follows is a short order of things, beginning with not starting the engine. Do not switch the ignition on; on plenty of diesels that alone runs the fuel pump. Filling up with diesel will not thin it: instead, AdBlue drops to the bottom of that tank, just where fuel is drawn from. The staff at Gulf, Morrisons or another forecourt will usually lend a hand pushing your car away if asked. At home around Southfields? Then the vehicle remains where it is. Where the engine has run by now, stop somewhere safe and switch the car off. Southfields lies under 5 miles from the M1; on it, use the next exit. Roughly how far did it go? Hopping across Southfields is smaller work than a run of under a mile towards Leicester, so say. ## What takes place when our engineers get there in Southfields Outside Sparkenhoe Community Primary School, close to Robert Hall or on your own driveway: wherever the vehicle has stopped, our technicians come to it. Both the work and our price rest on three replies — which fluid, which amount, and if it has run — so we ask. You hear that price on the phone, before anyone sets off. Then your tank is emptied and the fuel system purged thoroughly. Much more than with petrol, it matters with AdBlue: crystals build up, some metals corrode, and nothing washes away on its own, no matter how long it sits. After the filter is flushed — or replaced, where needed — clean diesel is added, and then the car gets tested. Then our technicians start it and confirm it runs properly before we go. If your engine hasn't run, most jobs take about half an hour once we are there, using pumps that are fine on a busy forecourt and quiet enough to use outside a house after dark. You pay on the day, with nothing upfront, and get a VAT invoice and an engineer report for your insurer. Before we get there, have a look at your policy; many carry cover for misfuelling. ## About Southfields, for a moment Southfields is a suburban area located on the outskirts of Leicester, with a mix of residential and commercial properties. Southfields sits at an elevation of around 80 metres, close to the city centre and nearby areas such as Highfields and Clarendon Park. Southfields is characterized by a high proportion of flat dwellings, reflecting its urban setting. Southfields is also relatively close to major transport links, with London approximately 88 miles to the south. ## Southfields and Leicestershire: AdBlue drains across the area Leicester and Clarendon Park are among the places around Southfields, a residential suburb, that the same teams cover, throughout LE postcodes. The van reaches you fastest with a postcode starting LE1 7. The car stays where it is. Wherever it sits — beside Tranquility, in a lay-by heading to Museum Square Park, at home — that's where it is cleared. If you're close to a boundary, or somewhere hard to describe like the back of Maeve Pepper, ring and ask instead of assuming. ## Southfields drivers: the short version Read the cap before you tip. Petrol in Diesel empties it on the spot, anywhere in Leicestershire, if AdBlue has gone in your diesel tank all the same — and so leave the vehicle off then ring 0333 366 0103.