--- title: Explained: AdBlue in a Diesel Tank Bonnyrigg canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/bonnyrigg-midlothian/ location: Bonnyrigg county: Midlothian latitude: 55.874010 longitude: -3.107050 service: AdBlue in a Diesel Tank updated: 2026-10-05 --- # Why It Happens and How to Prevent It: AdBlue in a Diesel Tank in Bonnyrigg Stop reading for a moment if the diesel tank already holds AdBlue in it: ignition off, engine off, and call 0333 366 0103. Normally, when your motor hasn't run, it is drained and thoroughly flushed where the car is around Bonnyrigg. Here in advance? In that case the rest explains why it comes about and what to stop it happening at all. ## Two fillers, two tanks: AdBlue in a diesel car Not one fluid but two: that is how plenty of modern diesels near Bonnyrigg and Broomieknowe run, with diesel feeding your engine. AdBlue goes to the exhaust, where it is sprayed into the gas to clean it, and it lives in a tank of its own. Each tank has its own filler. Plenty of cars have a single flap for both, whereas others move the AdBlue filler to the boot or under the bonnet. Filling the diesel side at the pump goes on constantly. The AdBlue side is topped up far less commonly, usually from a bottle, and normally by a person who has to stop and think where it goes. The mistake grows in that gap between them. ## AdBlue in the diesel tank around Bonnyrigg: how it happens It's rarely carelessness. Three things tend to line up. Hurry comes from the warning. The car tells you as AdBlue runs low, and an empty tank sends it into limp mode — so the top-up happens in a rush, before work on a drive off Dobbie's Road, or heading home in the car park outside The Chase. Next, the hand goes for the cap it knew on the old vehicle — because a hire car, a new car or a company car places the fillers where your last one did not. 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 pour once it has started. Staiside Court or the heart of Bonnyrigg: it takes the same few seconds in both. ## How to tell the AdBlue filler from the diesel one A few seconds is all the checks take — so check them before you pour anything, on a driveway in Lasswade or a forecourt around Bonnyrigg. - Where it sits misleads; the cap does not. AdBlue caps are often blue or bear the word "AdBlue" — diesel caps normally do not. - On many cars, the size tells: AdBlue gets the smaller filler neck. - Look inside your fuel flap: plenty of cars have a label there saying which fuel goes where. - The handbook. If the filler is not by your diesel cap, it is in your boot or under the bonnet, and the handbook says which. - Check with 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 outside Eskbank. ## AdBlue top-ups that never reach your diesel tank Wherever across Midlothian the light comes on, here is a routine for the day. - Stop on level, motor off, with time to spare — not rushing on the side of Park Crescent. - 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. - Using the bottle's own spout, pour slowly — and stop when it is full or the bottle is empty. - Before you start the vehicle, shut the cap and check a second time that the diesel cap never came off. If at step two or three you find you have already poured into the diesel side, stop there. Never carry on to step five. ## Already put AdBlue in your diesel tank in Bonnyrigg? Then the order of things is short. Do not start your motor. On plenty of diesels the ignition alone runs the fuel pump, so don't switch the car on. Topping up with diesel won't weaken it: rather than mixing, AdBlue sinks to the base of your tank, right where the fuel is taken from. If you're on a forecourt, whether it is the Tesco or the another forecourt nearby, ask the attendants to help roll the vehicle away from the petrol pump. If you're on your own driveway in Bonnyrigg, leave the car where it sits. Stop as soon as it is safe and switch off, if your motor has already run. Bonnyrigg sits under 10 miles from the M8; on it, use the next junction. A short hop across Bonnyrigg is a smaller job than a run towards Edinburgh, under 10 miles away, so tell us about how far it went. ## When our engineers get there in Bonnyrigg, what takes place? Wherever the car has stopped, be it outside the local primary school, near Madinah Masjid & Community Centre or on your own drive, our van travels to it. Our technicians ask what was put in, roughly how much, and whether it has run, since those replies decide this work and the quote. Nobody sets off until you have had the quote by phone. Then your tank is cleared and your system cleaned thoroughly. Much more than with petrol, it counts here: the crystals build up, certain metals corrode, and none of it washes out on its own, however long it is left. The fuel filter is cleaned, or replaced where it needs to be; fresh diesel goes in; and the vehicle is tested. Next we fire it up and check it runs smoothly before we go. Most jobs are done in about half an hour after our engineers arrive, as long as your motor has not run — and the pumps our engineers use are safe on a busy forecourt and quiet at night outside a house. Payment happens on the day, not upfront, and you receive the paperwork your insurer asks for: an engineer report and a VAT invoice. Before we get there, take a look at your insurance documents; plenty carry cover for misfuelling. ## About Bonnyrigg itself Bonnyrigg is a town in Midlothian, situated inland at an elevation of 107 metres, approximately 6 miles southeast of Edinburgh. Bonnyrigg has a mix of housing types, with terraced housing being predominant, and is close to nearby places such as Staiside Court and Waverley. Bonnyrigg is located near the Quarryhead area and has a population of around 18,103 people. Bonnyrigg is also relatively distant from London, at around 325 miles away. ## AdBlue drains round Bonnyrigg, and Midlothian beyond Being a town, Bonnyrigg shares its vans surrounding places — Waverley, Quarryhead — right through EH postcodes and the wider area beyond. Our van reaches you fastest with a postcode starting EH19 3. The car doesn't need to move. Our technicians drain it where it is — a side street near New Dundas Park, a lay-by on the way to King George V Park, a drive. Awkward to pin down, like the back of Scottish Workers Memorial? Close to a border? Checking beats assuming, and so ring. ## The short version for Bonnyrigg people Always, the cap; then, the tip. Petrol in Diesel drains it on the spot, anywhere across Midlothian, if AdBlue has gone in the diesel tank regardless — and so leave the car off then phone 0333 366 0103.