--- title: Explained: AdBlue in a Diesel Tank Westwood canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/westwood-cambridgeshire/ location: Westwood county: Cambridgeshire latitude: 52.585060 longitude: -0.271990 service: AdBlue in a Diesel Tank updated: 2026-10-22 --- # Preventing AdBlue in a Diesel Tank in Westwood: Why It Occurs Keep your motor and ignition off and call 0333 366 0103 first — the rest can wait if AdBlue is already in your diesel tank. Usually, when the motor hasn't run, it's emptied and fully rinsed where the vehicle is around Westwood. Not happened yet? Below, the rest of the page covers the reasons it takes place and the ways to prevent it altogether. ## Why does AdBlue in a diesel motor need its own filler? Not one fluid but two: that's how many newer diesels around Westwood and Millfield run, with diesel feeding your engine. 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. Other cars keep the AdBlue filler in your boot or under the bonnet; plenty more place both side by side behind one flap. The diesel side is filled at the pump all the time. Seldom filled, AdBlue normally goes in out of a bottle, poured by a driver who must stop and think which filler it needs. The error lives in that gap. ## How AdBlue in the diesel tank occurs around Westwood Seldom is it carelessness: usually three things coincide. Haste follows from the warning. The car warns you as AdBlue runs low, and a dry tank sends it into limp mode — so the top-up happens in a rush, before work on a drive off Edgcote Close, or heading home in the car park outside The Halcyon. Then the vehicle is unfamiliar. A hire car, a new motor or a company car puts the fillers where your last one did not, and the hand gets to for the cap it would have used on the old one. A spouted bottle meets no resistance at a diesel filler any more than at an AdBlue one. And so the tip, once begun, carries on. The same few seconds decide it, in the middle of Westwood or out in Ravensthorpe. ## The AdBlue filler and the diesel filler: telling them apart Before you pour anything, whether on a driveway in Longthorpe or a forecourt around Westwood, check these. They take a few seconds. - The cap. The AdBlue cap is frequently blue, or marked "AdBlue". Your diesel cap usually isn't. Read it rather than going by position. - Check the size: the smaller filler neck is, on many motors, the AdBlue one. - Lift the flap and check for a label — plenty of cars show which belongs in which filler right there. - The handbook shows where it is when your filler isn't next to your diesel cap: your boot, or under the bonnet. - The person who drove the vehicle last. On a hire or company car picked up from somewhere like the car park outside Peterborough, ask before you leave, not when the light comes on. ## How to top up without AdBlue in the diesel tank When the light goes on, anywhere in Cambridgeshire, use this routine. - Not in a rush on the side of Bretton Gate, not on a slope, not with your motor running: park and switch off first. - Locate the AdBlue filler, read the cap, and say the name "AdBlue" aloud while you unscrew it. It sounds daft. 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. - Gently does it, through the bottle's own spout, until it is full or the bottle runs out. - Before starting the vehicle, close the cap and look again that the diesel cap was never came off. Stop there if you find, at step two or three, that you've already poured into your diesel side. Skip stage five entirely. ## Put AdBlue in the diesel tank in Westwood already? Then the order of things is short. Don't start the engine. Keep the ignition off too, because on many diesels switching it on by itself runs your pump. AdBlue doesn't mix with diesel — it sinks to the bottom of your tank, where your fuel is pulled from — so don't top up with diesel to thin it. The attendants at Shell, BP or any forecourt will normally lend a hand pushing the vehicle clear if asked. If you are on your own drive around Westwood, leave the car where it sits. Where the motor has been run by now, stop somewhere safe then switch it off. Westwood lies under 5 miles from the A1(M); on it, take the next exit. A short hop across Westwood is a smaller job than a run towards Peterborough, under 3 miles away, so tell us roughly how far it went. ## When our technicians arrive around Westwood, what occurs? Wherever the car came to rest, whether by Highlees Primary School, near St. Jude's or on your own drive, the van travels to it. The answers decide this work and our quote, and so our engineers ask what got in, roughly how much, and if it has run. You hear that quote by phone, before anyone heads out. Next: draining, then a full flush of the whole system. AdBlue crystallises and is corrosive to some of the metals in a fuel system, so it does not wash out on its own — which is why the flush matters more with AdBlue than with petrol. Testing comes at the end: before that, clean diesel goes in, and the filter is cleaned or changed as needed. Before we leave, we fire it up and confirm that it's running properly. Most jobs are done in roughly half an hour after our technicians get there, provided your motor has not run — and the pumps our technicians use are fine on a busy forecourt and quiet at night beside a house. No money upfront; you settle up on the day. At the end, a VAT invoice and the report from the engineer are handed to you for the insurer. Many insurance policies include misfuelling cover, and so it's worth checking yours while we're on the way. ## About Westwood itself Westwood is a suburban area located near Peterborough in Cambridgeshire, sitting at an elevation of 19 metres in the eastern part of England. Westwood is characterized by its predominantly terraced housing and is situated close to nearby places such as Ravensthorpe, Bretton, and New England. Westwood has a population of approximately 6400 residents and is about 1.5 miles from the city centre of Peterborough. Westwood is also within commuting distance to London, being around 74.7 miles away. ## AdBlue drains across Cambridgeshire, Westwood included Westwood is a residential suburb, and our teams that cover it also work the towns near it, Bretton and New England among them, across the PE postcode area. Quickest of all: quote a PE3 7 postcode for our van. Shifting the car is not necessary. A driveway, a lay-by on the way to Peterborough Town Sports Club, a side street near The Church of Jesus Christ of Latter-day Saints: our technicians drain the vehicle where it stands. Guessing won't help behind Body, Mind & Spirit, close to a boundary, or anywhere awkward to describe; phone and ask. ## In short, for Westwood drivers Always, the cap; after that, the tip. Still AdBlue in the diesel tank? Petrol in Diesel will drain it where it is, wherever around Cambridgeshire: switch the vehicle off then call 0333 366 0103.