--- title: Spreakley: AdBlue in a Diesel Tank, Explained canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/spreakley-surrey/ location: Spreakley county: Surrey latitude: 51.169340 longitude: -0.799980 service: AdBlue in a Diesel Tank updated: 2026-10-02 --- # Spreakley: How Does AdBlue End Up in a Diesel Tank, and How Do You Prevent It? If AdBlue is already in your diesel tank, stop reading for a moment: leave the motor and the ignition off then phone 0333 366 0103. Around Spreakley, finding it before the motor runs usually leaves a drain and a thorough flush on the spot. 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 motor need its own filler? Diesel feeds your engine — but plenty of modern diesels driven around Spreakley and Millbridge hold a second liquid too. Your exhaust, not the motor, is where AdBlue ends up: sprayed into the gas to fresh it, from a separate tank. There's a filler for every tank. Under one flap, side by side: that's the arrangement on a lot of motors. Elsewhere, AdBlue's filler sits beneath the bonnet or in your boot instead. Filling the diesel side at the petrol pump goes on constantly. Someone who has to stop and think where it goes usually tops up the AdBlue side, from a bottle, and far less often. That gap is where the mistake lives. ## Spreakley: how AdBlue in your diesel tank occurs Rarely is it carelessness: usually three things line up. On a driveway off Shortfield Common Road before work, or in the car park at The Holly Bush on the way home: that's where the rushed top-up takes place. What is the reason for the rush? As AdBlue runs low the vehicle tells you, and if it is gone, limp mode kicks in. The old car's filler is where your hand reaches — yet a rental car, a new car or a company car keeps the fillers elsewhere. That's the second factor: a strange vehicle. A spout-topped bottle meets no resistance at a diesel filler no more than at an AdBlue one. And so the pour, after started, carries on. The same few seconds settle it, in the middle of Spreakley or out in Frensham. ## Telling the AdBlue filler from the diesel filler Be it a Spreakley forecourt or a driveway out in Batts Corner, take a few seconds over these before any goes in. - Read the cap rather than going by where it sits: AdBlue ones are often blue or marked "AdBlue", and diesel caps usually are not. - Look at the size: the smaller neck is, on plenty of cars, the AdBlue one. - A label inside your fuel flap frequently shows which fuel goes where, on plenty of cars. Look for it. - Cannot see it beside your diesel filler? In that case look beneath the bonnet or inside the boot — the owner's manual says which. - Collecting a hire or company car, perhaps at the car park at Farnham? Ask whoever drove the car last before you set off, not when the light comes on. ## Keeping AdBlue out of the diesel tank when you top up A routine for the day the light comes on, wherever around Surrey that is. - Not in a rush on the side of Hammondswood Road, not on a slope, not with your motor running: park and switch off properly. - 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 share a flap, confirm it is closed before lifting the bottle. - Slowly is best, through the bottle's own spout, until it's full or the bottle runs out. - Before starting the car, shut the cap and check a second time that the diesel cap was never came off. Find at stage two or three that it's already gone into the diesel side? Then stop just there. Step five is out. ## AdBlue in your diesel tank already, around Spreakley? Then the order of things is short. Don't start your engine. Don't switch your ignition on; on plenty of diesels that alone runs the fuel pump. AdBlue doesn't mix with diesel — it sinks to the bottom of the tank, where your fuel is drawn from — so do not top up with diesel to thin it. If you're at a forecourt, whether it's the Shell or the Texaco, ask the staff to help push the car clear of the petrol pump. On your own drive around Spreakley? Then the vehicle remains where it is. If your engine has already run, stop as soon as it is safe and switch off. On the M3, under 10 miles from Spreakley, that means the next junction. Roughly how far did it go? Hopping across Spreakley is smaller a job than a trip of under 25 miles to Chichester, so tell us. ## When our technicians get there around Spreakley, what occurs? Our engineers come to the car wherever it has stopped, whether that is outside St Mary's CofE Aided Infant School, Frensham, close to St Mary's Church or on your own driveway. Both the work and our price rest on three replies — which liquid, which quantity, and if it's run — so we ask. You hear that price by phone, before anyone sets off. The fuel system is then flushed thoroughly, once your tank is cleared. Much more than with petrol, it counts with AdBlue: crystals build up, certain metals are attacked, and nothing clears away unaided, however long it is left. Testing is at the end: before that, fresh diesel goes in, and the filter is cleaned or replaced as needed. Then we fire it up and confirm it runs correctly before leaving. Unstarted cars usually need a half-hour visit from arrival. The equipment is fine on a live forecourt, and hushed enough for a driveway late at night. You pay on the day, with nothing upfront, and get a VAT invoice and an engineer report for your insurer. Misfuelling cover is part of many insurance policies — so make use of the wait to check yours. ## About Spreakley, for a moment Spreakley is a small hamlet situated on the riverside in Surrey, with an elevation of around 71 metres. Spreakley lies near the villages of Frensham and Lane End, and is also close to Shortfield Common. Spreakley is characterized by its predominantly detached housing stock, reflecting its rural setting. Spreakley is located approximately 37 miles from London, making it a relatively rural outpost in the South East region. ## AdBlue drains across Surrey, Spreakley included Throughout GU postcodes, our vans covering Spreakley — a rural hamlet — work the nearby spots too, Shortfield Common and Lane End among them. Quickest of all: quote a GU10 3 postcode to the van. The vehicle doesn't need to shift. Our engineers drain it where it is — a side street near Royal British Legion, a lay-by on the way to Hammonds Wood, a driveway. Guessing won't help at the back of Red Cube Gallery, close to a border, or anywhere hard to pin down; phone and check. ## The short version for Spreakley drivers Before you tip, read the cap. Petrol in Diesel drains it on the spot, anywhere in Surrey, if AdBlue has gone in the diesel tank anyway — and so leave the car off then phone 0333 366 0103.