--- title: AdBlue in a Diesel Tank Sleaford? Read This canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/sleaford-lincolnshire/ location: Sleaford county: Lincolnshire latitude: 52.999450 longitude: -0.410380 service: AdBlue in a Diesel Tank updated: 2026-10-19 --- # How It Happens and How to Avoid It: AdBlue in a Diesel Tank in Sleaford AdBlue already in the diesel tank? Then set this page down for now, keep your ignition and engine off, and ring 0333 366 0103. Around Sleaford, finding it before your motor turns normally means draining and a thorough flush where it stands. 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. ## Why does AdBlue in a diesel vehicle need its own filler? Plenty of modern diesels around Kirkby la Thorpe, as well as Sleaford, carry on two fluids; your engine takes just your diesel. Your exhaust, not the motor, is where AdBlue goes: sprayed into the gas to fresh it, from its own tank. Every tank comes with one filler of its own. Under one flap, next to each other: that is the arrangement on a lot of motors. On others, AdBlue's filler is under the bonnet or in the boot instead. Topping up your diesel side at the petrol pump goes on constantly. Someone who has to stop and work out where it goes normally fills the AdBlue side, from a bottle, and far less often. It is in the gap that the mistake lives. ## AdBlue in the diesel tank around Sleaford: how it happens It is seldom carelessness. Three things tend to line up. To start with, the warning. Low AdBlue triggers a warning from your car, and running out means limp mode — so a hurried top-up, perhaps before work off North Gate, or outside The Packhorse Inn on the way home that evening. Next, the hand reaches for the cap it knew on the old vehicle — because a hire car, a new motor or a company car places the fillers where your last one did not. Nothing stops the pour once it has started, because a bottle with a spout goes into a diesel filler as readily as an AdBlue one. The bottle fits. The same few seconds settle it, in the middle of Sleaford or out in Holdingham. ## Which filler is for AdBlue, and which for diesel? Whether a Sleaford forecourt or a drive over in Leasingham, take a few seconds over these before any is poured in. - Check the cap rather than going by position: AdBlue ones are frequently blue or marked "AdBlue", and diesel ones normally aren't. - The size. On many cars the AdBlue filler neck is the smaller of the two. - Open the flap and check for a label — many vehicles mark what goes in which inlet right there. - Can't see it beside your diesel inlet? In that case look below the bonnet or in the boot — the owner's manual will say where. - Collecting a hire or company car, perhaps at the car park at the nearest station? Check with the person who drove it last before leaving, not once the light comes on. ## How to top up without AdBlue in the diesel tank A routine for the day the light comes on, wherever in Lincolnshire that is. - Not in a rush on the side of East Gate, not on a slope, not with your engine running: park and switch off first. - Find the AdBlue filler and read the cap. Say "AdBlue" out loud as you unscrew it. It sounds silly and it does the trick. - The diesel cap remains on. When both sit under a flap, confirm it's shut before lifting the bottle. - Using the bottle's own spout, pour slowly — and stop when it is full or the bottle is empty. - Close the cap and check again. Make sure the diesel cap was never opened. Only then start the vehicle. Spot at step two or three that it's already gone into the diesel side? So stop right there. Never go on to step five. ## Put AdBlue in the diesel tank around Sleaford already? The short order of things, beginning with not starting your motor. Don't switch your ignition on; on plenty of diesels that alone runs the fuel pump. Topping up with diesel will not weaken it: rather than mixing, AdBlue drops to the base of that tank, just where the fuel is drawn from. The staff at Tesco, Power or another forecourt will usually lend a hand pushing your car away if you ask. If you are on your own drive in Sleaford, leave the vehicle where it stands. When the engine has run already, stop somewhere safe then switch it off. On the Great North Road, under 50 miles from Sleaford, that means the next exit. About how far did it go? Hopping across Sleaford is less work than a run of under 25 miles to Lincoln, so tell us. ## Our arrival around Sleaford, and what happens next Our engineers come to the car wherever it has stopped, whether that is outside Church Lane Primary School & Nursery, close to Sleaford Library or on your own drive. The replies settle this work and the price, and so we ask what got in, about how much, and whether it's run. No one heads out until you have had the quote by phone. The system is then flushed thoroughly, once the tank is drained. With AdBlue that counts more than with petrol: it crystallises and is corrosive to some of the metals in a fuel system, and so it doesn't wash out on its own. The filter flushed or, where needed, swapped; clean diesel in; and then a check of the car. We don't leave until it has been started and is running properly. Using pumps safe on a working forecourt and quiet enough for use outside a house at night, most jobs where the motor hasn't run need about half an hour after we arrive. You pay on the day, with nothing upfront, and get a VAT invoice and an engineer report for your insurer. Many insurance policies include misfuelling cover, so it's worth checking yours whilst we're on the way. ## About Sleaford, briefly Sleaford is a town in southern Lincolnshire, situated on the River Slea at an elevation of around 20 metres. Sleaford lies approximately 17 miles south of Lincoln and 103 miles north of London, with nearby villages including Holdingham, New Quarrington, and Quarrington. Sleaford has a population of around 16,349 people and is characterised by its predominantly detached housing stock. Sleaford's riverside setting has influenced its development over time, with the town expanding along the river valley. ## AdBlue drains about Sleaford, and Lincolnshire beyond Sleaford is a riverside town, and our vans that cover it also work the towns around it, New Quarrington and Quarrington among them, across the NG postcode area. The van gets to you fastest with a postcode starting NG34 7. The car doesn't need to shift. Anywhere it sits — beside Paish Centre, in a layby heading to Castle Field, at home — that's where it is emptied. If you're close to a border, or somewhere hard to describe like the back of Saint Denys', ring and ask instead of assuming. ## For Sleaford people, the short version Always, the cap; then, the tip. Petrol in Diesel drains it on the spot, anywhere in Lincolnshire, if AdBlue has gone in your diesel tank anyway — so leave the vehicle off then call 0333 366 0103.