--- title: AdBlue in a Diesel Tank Ty Coch: Explained canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/ty-coch-torfaen/ location: Ty Coch county: Torfaen latitude: 51.637580 longitude: -3.024100 service: AdBlue in a Diesel Tank updated: 2026-10-10 --- # Avoiding AdBlue in a Diesel Tank in Ty Coch: Why It Happens Pause reading a minute if the diesel tank already holds AdBlue in it: ignition off, engine off, and ring 0333 366 0103. Normally, when your engine hasn't run, it is drained and thoroughly rinsed where the car sits around Ty Coch. Here before the event? In that case what follows covers why it happens and what to stop it ever happening. ## AdBlue in a diesel motor, and its separate tank Many modern diesels around Old Cwmbran, like those in Ty Coch, carry on two liquids; your motor takes just the diesel. Stored in a tank of its own, AdBlue is sprayed into your exhaust stream to clean it. There is a filler on each tank. Some vehicles keep the AdBlue filler in your boot or under the bonnet; plenty of others place both together behind one flap. At the pump, your diesel side gets filled constantly. Much less commonly, the AdBlue side is filled — normally from a bottle, by someone thinking about where it goes. It is in the gap that the error happens. ## How does AdBlue in the diesel tank occur in Ty Coch? It's seldom carelessness. Three things tend to line up. To start with, the warning. Low AdBlue brings a message from the car, and running dry means limp mode — hence a rushed top-up, perhaps before work off Cwrt Dowlas, or at Waterloo Inn on the way home after work. The old car's cap is where the hand reaches — yet a hire car, a new vehicle or a company car puts the fillers elsewhere. That's a second thing: a new vehicle. A spouted bottle finds no obstacle at a diesel filler any more than at an AdBlue one. So the tip, once begun, carries on. It takes a few seconds, whether in Two Locks or bang in the heart of Ty Coch. ## Which filler is for AdBlue, and which for diesel? Check these before pouring, at a forecourt around Ty Coch or a driveway over in Llantarnam. Seconds, that's all. - Blue and marking: an AdBlue cap is often blue, or says "AdBlue", where a diesel cap usually doesn't. Trust the cap, not where it sits. - Check the size: the smaller neck is, on many cars, the AdBlue one. - Look inside your fuel flap: plenty of motors carry a label there saying which fuel goes where. - The handbook shows where it is if your filler is not next to the diesel cap: your boot, or under the bonnet. - Picking up a hire or company car, perhaps at the car park at Cwmbran? Check with whoever drove the vehicle last before leaving, rather than when the light goes on. ## How to top up without AdBlue in the diesel tank The day the light comes on, wherever around Torfaen, follow this routine. - Turn off after you park — level ground, engine off, and never rushed beside Ty-Coch Lane at the roadside. - Locate the AdBlue filler, read the cap, and say the name "AdBlue" aloud while you unscrew it. It sounds daft. It works. - The diesel cap remains on. Where both share a flap, confirm it is shut before the bottle comes up. - Tip slowly, using the bottle's own spout. Stop when it's full or when the bottle is empty. - Close the cap and check once more. Make sure the diesel cap was never opened. Only then start the car. If at step two or three you find you have already poured into the diesel side, stop there. Stage five is out. ## Put AdBlue in your diesel tank in Ty Coch already? What follows is a short order of things, beginning with no starting the engine. The fuel pump starts on plenty of diesels as soon as your ignition is switched on — so keep it off. AdBlue doesn't mix with diesel — it sinks to the bottom of that tank, where the fuel is drawn from — so don't top up with diesel to thin it. Ask the staff to help roll the vehicle clear of the pump if you are on a forecourt — the Shell, the Sainsbury's or anywhere else. If you're on your own drive in Ty Coch, leave it where it is. Already run? Stop when it's safe, then switch off. The next exit means where to come off if you are on the M4, under 3 miles from Ty Coch. Distance matters — a short hop across Ty Coch makes a smaller job than driving under 5 miles towards Newport — so tell us roughly how far it went. ## What happens when we turn up around Ty Coch By the local primary school, near John Williams Fielding VC or on your own drive: wherever your car has stopped, our engineers come to it. What liquid got in, the quantity, and whether it ran: our engineers ask since the replies decide the work and price. Nobody heads out until you have had our price by phone. Your system is then rinsed thoroughly, once your tank is emptied. AdBlue crystallises and is corrosive to some of the metals in a fuel system, so it doesn't wash out on its own — which is why that counts more with AdBlue than with petrol. After your filter is cleaned — or renewed, where needed — clean diesel is added, and finally the car gets tested. Then our engineers start the car and make sure it runs correctly before leaving. Unstarted cars usually need a half-hour job from arrival. The equipment is safe on a live filling station, and quiet enough for a residential street late at night. No money upfront; you settle up that day. At the end, a VAT invoice and the report from the engineer are handed to you for your insurer. Many insurance policies include misfuelling cover, and so it's worth checking yours whilst we are on the way. ## About Ty Coch itself Ty Coch is a suburban area in Torfaen, situated on the riverside at an elevation of 57 metres, with semi-detached housing being the predominant type of accommodation. Ty Coch is located near the city of Newport, approximately 3.6 miles away, and is close to other nearby places such as Two Locks, Oakfield, and Hollybush. Ty Coch has a population of around 2335 people and is part of the wider urban area surrounding Newport. Ty Coch benefits from its proximity to the city while maintaining a distinct character of its own. ## AdBlue drains in Ty Coch and across Torfaen As a residential suburb, Ty Coch has the same vans as surrounding areas — Oakfield, Hollybush — right through NP postcodes and the wider area beyond. Our van gets to you fastest with a postcode starting NP44 7. Moving your car is not needed. The drain takes place right there, be it a drive, a street by Crucifix, or a lay-by on the way to Oakfield Park. If you're near a boundary, or somewhere hard to explain like the back of Cwmbran Stadium, ring and ask rather than assuming. ## For Ty Coch people, the short version Always, the cap; then, the tip. Petrol in Diesel drains it where it stands, anywhere across Torfaen, if AdBlue has gone in your diesel tank all the same — so leave the car off and phone 0333 366 0103.