--- title: What Now? AdBlue in a Diesel Tank Testwood canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/testwood-hampshire/ location: Testwood county: Hampshire latitude: 50.927040 longitude: -1.498040 service: AdBlue in a Diesel Tank updated: 2026-10-07 --- # What Now? AdBlue in the Diesel Tank in Testwood What to do about AdBlue in a diesel tank comes down to one thing more than any other: if the engine has been run since it was put in. If it hasn't, keep it that way, whether the car is in Testwood itself or out in Calmore. Leave your engine and the ignition off then call 0333 366 0103; it's generally a drain and a thorough flush, done where the car is in Testwood. When the motor has run, stop somewhere safe straight away, then switch it off. It's a bigger job, though step one does not change. Below: the cases our technicians see, wherever in Hampshire. Choose the one that fits. ## At the pump in Testwood: AdBlue in a diesel You're at the petrol pump, the nozzle or the bottle still in your hand, and you have just noticed the cap you opened was the wrong one. Whether Esso, Morrisons or anywhere else around Testwood, the situation is the same. The upshot: of all places to notice, the forecourt is the best. Only your tank holds AdBlue; no part beyond it has taken any in. Do this: stay out of the car, even if the queue needs clearing. Ask the attendants to help you roll the vehicle into a parking bay, keep the till receipt or the bottle, then ring us from the forecourt. If it cannot be moved, it can be emptied at the pump: the equipment is explosion-proof and fine on a busy forecourt. ## AdBlue in the diesel tank at home in Testwood The warning light had been on for days. Only by the recycling, the empty container in hand, did you glance back at the cap you'd used on the driveway. It takes place on driveways just off Huntingdon Close as frequently as anywhere. What it means: if you have not driven since, this is almost as good as the forecourt. AdBlue does not mix with diesel; it sinks to the bottom of that tank and waits there. Overnight doesn't change that. Put the keys in the house tonight — or a person might take it away at breakfast — then call us. Out in Hammonds Green or right here around Testwood, the draining happens at your driveway. Even at night, the pumps stay quiet enough for a driveway. ## Drove off with AdBlue in a diesel in Testwood? Topped up, pulled away, and before long the engine was running roughly, blowing smoke, down on power, or flashing up the dash. It might have been heading to Southampton, under 5 miles away, or just down Hamtun Gardens. The upshot: your system has drawn AdBlue through by now. Past the filter, along the pipework, and — the more the mileage — on into the injection pump and every injector. More miles, more restarts: further it travels. Your move: stop anywhere sensible, then switch the motor off. Testwood lies under 3 miles from the M271; there, come off at the next junction rather than pressing on for the services. Starting it again to test gets nothing — AdBlue doesn't clear itself. Ring us and say how far you went. ## AdBlue in the wrong tank of a hire, lease or company car It's a vehicle you have had for a week. Unbeknown to you, the AdBlue and diesel fillers sit next to each other here — not like your own car, which has no AdBlue or stores it in another spot. It can happen to anyone, anywhere across Hampshire. In short: one extra step on top of the situations above, and those depend on whether it's run. Many hire and company agreements want the owner to approve work on the car. Next: phone the hire company or the fleet manager first, and then us — sorting it before our arrival is faster. Leave it off while the reply arrives, even if you're waiting at Totton or close to Testwood Baptist Church. ## Not sure it was AdBlue in your diesel tank, Testwood? At times, "I think so" is all anyone can truthfully say. The bottle is lighter than it should be, there is a faint smell of ammonia round the filler, and you cannot remember which cap you took off. It might have been on a friend's driveway in Redbridge, or in a rush outside Oakfield Academy at the school run. Meaning? Spills outside the inlet don't reach your motor at all. Once it's inside the diesel tank, though, it does. Any AdBlue in that tank would be sucked in by firing up the car, and the start would not settle which it is in any case. What to do: treat it as if it was put in. Do not start the vehicle. Phone with the details: we'd rather find a clean tank than drain one after your motor has been run. ## Testwood: what each AdBlue drain has in common The job begins identically, whatever the case. Filling station, drive, The Testwood's car park or a street beside Kingdom Hall of Jehovahs Witnesses — our van reaches your car, and three answers come next: which fluid, which quantity, and whether it has run. Those replies settle this work, and you get the price by phone, before anybody heads out. AdBlue crystallises and eats at certain metals used in fuel systems, and so it won't wash out unaided; that is why the flush, after this drain, counts much more with AdBlue than with petrol. The filter is cleaned, or replaced where it needs to be; fresh diesel goes in; and the car is tested. The majority of unstarted cars are a half-hour job after the moment our technicians arrive. Firing it up comes at the end. Our test that it runs properly on fresh diesel comes before we head off. Lasting damage is very rare when it is noticed soon, and the entire job is done where the car is. Nothing is taken upfront, payment happens on the day, and you get what your insurer wants: an engineer report and a VAT invoice. Many insurance policies include misfuelling, and so look at yours while the van travels. ## About Testwood itself Testwood is a suburban area located near the coast in Hampshire, with a low elevation of around 9 metres above sea level. Testwood sits close to the city of Southampton, approximately 4.4 miles away, and is surrounded by other nearby places such as Hammonds Green and Totton. Testwood has a population of around 4095 people and is characterised by predominantly detached housing. Testwood is also situated within commuting distance of London, around 71.6 miles away. ## AdBlue drains across Hampshire, Testwood included Totton and Brokenford have the same teams as Testwood, a residential suburb, plus further places over SO postcodes. Giving us a SO40 3 postcode pins you quickest of all. No towing is required, be it stopped centrally in Testwood or on a lay-by heading to Testwood Recreation Ground, and so leave it where it is. Where it stands, that is where it gets cleared. Tricky to explain? Close to St. Winfrid's or a county line? Asking beats guessing, so phone. ## In one line: your scenario Unstarted? Keep the car off and ring. Whichever line fits, Petrol in Diesel handles the rest on 0333 366 0103, throughout Hampshire and in Testwood — after you pull over, turn off and ring, if it's run.