--- title: AdBlue in a Diesel Tank Great Casterton: Explained canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/great-casterton-rutland/ location: Great Casterton county: Rutland latitude: 52.668440 longitude: -0.521050 service: AdBlue in a Diesel Tank updated: 2026-10-21 --- # Great Casterton: How Does AdBlue End Up in a Diesel Tank, and How Do You Prevent It? Stop here for a moment if your diesel tank already has AdBlue in it: ignition off, motor off, and phone 0333 366 0103. A drain plus a thorough flush, done right where the vehicle stands in Great Casterton, is usually all it takes if found before your motor runs. Reading in advance? Then what follows explains how it happens and how to stop it happening at all. ## AdBlue in a diesel vehicle: two tanks, two fillers Not one liquid but two: that's what many modern diesels around Great Casterton and Tinwell run, with diesel for the motor. AdBlue goes to your exhaust, where it is sprayed into the gas to fresh it, and it lives in a tank of its own. Each tank has its own filler. On a lot of vehicles the two sit side by side under the same flap; on others the AdBlue filler is in your boot or under the bonnet. Filling the diesel side at the pump goes on constantly. The AdBlue side is fuelled far less frequently, normally from a bottle, and usually by a person who has to stop and think where it goes. Mistakes happen in the gap between the two. ## AdBlue in your diesel tank in Great Casterton: how it happens Three things tend to line up, and carelessness is seldom one of them. To start with, the warning. Low AdBlue brings a message from the car, and letting it run dry leads to limp mode — hence a hurried top-up, perhaps before work off Home Farm Close, perhaps at The Crown on the way home that evening. The old car's filler is where the hand goes — but a hire car, a new vehicle or a company car puts the fillers somewhere else. That's the second thing: an unfamiliar vehicle. And the bottle fits. A bottle with a spout goes into a diesel filler as easily as an AdBlue one, and so nothing stops the tip after it has started. It takes a few seconds, whether in Ingthorpe or bang in the centre of Great Casterton. ## Telling the AdBlue filler from your diesel filler Before you pour anything, whether on a driveway in Northfields or a forecourt in Great Casterton, check these. They take a couple of seconds. - Read the cap rather than going by position: AdBlue ones are commonly blue or marked "AdBlue", and diesel ones usually aren't. - Check the size: the smaller filler neck is, on plenty of vehicles, the AdBlue one. - Open the flap and check for a label — many motors mark which belongs in each inlet just there. - In your boot or under the bonnet: that's where the filler sits if it is not by your diesel cap, and the handbook says which. - Collecting a hire or company car, perhaps at the car park at Stamford? Check with the person who drove the vehicle last before you set off, not when the light comes on. ## How to top up without AdBlue in the diesel tank Anywhere across Rutland the light comes on, here is a routine for that day. - Park and switch off. Not on a slope, not with the motor running, and not in a rush on the side of Water Lane. - Say "AdBlue" out loud as you unscrew the cap, once finding the AdBlue filler and reading it. Silly, perhaps, yet it works. - If both sit under one flap, check the diesel cap is still closed before you lift the bottle — and leave it on. - Tip slowly, using the bottle's own spout. Stop when it's full or when the bottle is empty. - Close the cap, then look again — confirm the diesel filler stayed closed throughout. After that, start the car. Find at step two or three that it's already gone into the diesel side? So stop right there. Don't carry on to stage five. ## Put AdBlue in the diesel tank around Great Casterton already? Brief order, then. First: the motor remains off. Do not switch your ignition on; on plenty of diesels that alone runs the fuel pump. Topping up with diesel won't thin it: rather than mixing, AdBlue drops to the bottom of the tank, right where the fuel is drawn from. On a forecourt — BP, Morrisons or another — the staff will usually help roll the vehicle clear, when you ask. Your own drive around Great Casterton is the place it stays. If your engine has already run, stop as soon as it is safe then switch off. The next exit is where to come off when you are on the Great North Road, under 15 miles from Great Casterton. Distance matters — a short hop across Great Casterton is a smaller job than driving under 15 miles towards Peterborough — so say about how far it went. ## Our arrival in Great Casterton, and what takes place next Our van reaches the car wherever it has come to rest — your own driveway, near Saint Peter and Saint Paul, or outside Great Casterton Church of England Primary School. We ask what got in, about how much, and if it's run, because the replies determine this work and our quote. No one sets off before you've had our price by phone. The fuel system is then rinsed 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, so it does not wash out on its own. Testing is last: before that, clean diesel goes in, and the filter is flushed or changed as needed. The engine is started next and checked to be sure it runs properly, all before our engineers head off. If the motor hasn't run, the majority of jobs take about half an hour once we are there, using pumps that are safe on a busy forecourt and quiet enough to use outside a house after dark. The insurer usually wants the engineer's report and your VAT invoice, and you get both at the end. Payment is on the day, with no money upfront. While we travel, have a look at your insurance documents; many carry cover for misfuelling. ## About Great Casterton itself Great Casterton is a small village situated on the riverside in Rutland, with a population of around 600 people. Great Casterton has a mix of old and new housing, but predominantly features detached homes. Great Casterton sits at an elevation of 46 metres, close to the nearby villages of Ingthorpe, Tickencote, and Little Casterton. Great Casterton is located near Peterborough, the nearest city, which is approximately 13 miles away. ## AdBlue drains about Great Casterton, and Rutland beyond Being a village, Great Casterton has the same vans as nearby areas — Tickencote, Little Casterton — all the way across PE postcodes and the wider area around them. Quickest of all: give a PE9 4 postcode to our van. Shifting the vehicle is not needed. A drive, a lay-by on the way to Stamford Rugby Club, a side street close to Roman Villa (Site of): we drain the vehicle where it sits. Ring and ask rather than guessing if you are near a border, or somewhere hard to explain, like the back of Parish Church of St. Peter. ## For Great Casterton people, the short version Always, the cap; then, the pour. AdBlue in your diesel tank after all? Leave the vehicle off and call 0333 366 0103; Petrol in Diesel empties it where it stands, across Rutland.