--- title: Upper Skelmorlie: AdBlue in a Diesel Tank, Explained canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/upper-skelmorlie-north-ayrshire/ location: Upper Skelmorlie county: North Ayrshire latitude: 55.869200 longitude: -4.882870 service: AdBlue in a Diesel Tank updated: 2026-10-13 --- # Preventing AdBlue in a Diesel Tank in Upper Skelmorlie: Why It Happens Pause reading for a moment when the diesel tank already holds AdBlue in it: ignition off, motor off, then phone 0333 366 0103. A drain and a full flush, carried out right where your vehicle stands in Upper Skelmorlie, is usually what it takes if caught before the motor runs. Here in advance? Then the rest covers why it happens and how to prevent it happening at all. ## AdBlue in a diesel motor, and its separate tank Diesel goes to your motor — yet plenty of current diesels seen about Upper Skelmorlie and Inverkip carry a second liquid too. The exhaust, not the motor, is where AdBlue goes: dosed into the fumes to fresh it, from a separate tank. Different tanks, separate fillers. Plenty of motors have a single flap for the two, while others move the AdBlue filler to your boot or under the bonnet. Diesel goes in on every filling station visit, week in, week out. A driver who has to stop and think where it goes usually fills the AdBlue side, from a bottle, and much less regularly. The mistake grows in that gap between them. ## Upper Skelmorlie: how AdBlue in the diesel tank takes place It's rarely carelessness. Three things tend to line up. On a drive off Skelmorlie Cross before work, or in the car park outside Eglinton Bar on the way home: that is where the hurried top-up happens. Why the rush? As AdBlue gets low the car tells you, and once it is empty, limp mode follows. The old car's filler is where your hand reaches — but a rental car, a new motor or a company car puts the fillers elsewhere. That is a second factor: a new vehicle. Third, the bottle fits: a diesel filler or AdBlue filler, it slides in just as easily, and after the pour starts, no part stops it. Whether it occurs in Skelmorlie or the middle of Upper Skelmorlie, it is the same few seconds. ## Which filler is for AdBlue, and which for diesel? A few seconds is all the checks take — so run through them before you tip anything, on a drive in Bridgend or a forecourt in Upper Skelmorlie. - Read the cap rather than going by where it sits: AdBlue caps are commonly blue or marked "AdBlue", and diesel caps usually aren't. - Plenty of cars give AdBlue the smaller neck of the two. - Look inside the fuel flap: plenty of motors carry a label there saying which fuel goes where. - The handbook. If the filler is not by the diesel cap, it's in the 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 Wemyss Bay. ## Topping up AdBlue without it reaching the diesel tank A routine for the day the light comes on, wherever across North Ayrshire that is. - Not in a rush on the side of Sandybrae Road, not on a slope, not with the engine running: park and switch off first. - Locate the AdBlue filler, read the cap, and speak the name "AdBlue" aloud as unscrewing it. It seems daft. It works. - If both sit under one flap, check the diesel cap is still closed before you lift the bottle — and leave the vehicle on. - Using the bottle's own spout, pour slowly — and stop when it's full or the bottle is empty. - Before you start the car, shut the cap and look again that the diesel cap was never came off. If at stage two or three you find you have already poured into your diesel side, stop there. Step five stays out. ## Put AdBlue in your diesel tank in Upper Skelmorlie already? Then the order of things is short. Don't start the motor. On plenty of diesels the ignition alone runs the fuel pump, and so do not switch the vehicle on. Topping up with diesel won't thin it: rather than mixing, AdBlue sinks to the bottom of that tank, right where fuel is drawn from. At a forecourt — Gulf, another forecourt nearby or another — the staff will normally help push the car away, if you ask. If you're on your own driveway in Upper Skelmorlie, leave the car where it stands. Already started? Pull over once it's safe, then switch off. Upper Skelmorlie sits under 15 miles from the M8; there, take the next junction. Roughly how far did it go? Hopping across Upper Skelmorlie is less work than a trip of under 50 miles to Glasgow, so say. ## Our arrival in Upper Skelmorlie, and what happens next Anywhere the car came to rest, be it outside the local primary school, beside Skelmorlie & Wemyss Bay Parish Church or on your own drive, the van travels to it. Which liquid went in, the amount, and whether it ran: our engineers ask because the answers set the work and quote. The price is given over the phone, ahead of any van leaving. Then that tank is drained and the fuel system purged thoroughly. With AdBlue that matters more than with petrol: it crystallises and is corrosive to some of the metals in a fuel system, and so it doesn't wash out on its own. Filter cleaned or, if needed, swapped; fresh diesel in; and then a test of your vehicle. Your engine is fired up next and checked to make sure it runs correctly, all before our technicians head off. Unrun cars usually mean a half-hour visit from the moment we arrive. The kit is fine on a busy forecourt, and hushed enough for a residential street late at night. No money upfront; you settle up on the day. Afterwards, a VAT invoice and the report from the engineer are handed to you for your insurer. While we travel, have a look at your insurance documents; many include cover for misfuelling. ## About Upper Skelmorlie, briefly Upper Skelmorlie is a suburban area situated on the coast of North Ayrshire, with a mix of detached housing and scenic views. Upper Skelmorlie sits at an elevation of 73 metres, overlooking the Firth of Clyde and the surrounding landscape. Upper Skelmorlie is located near the towns of Skelmorlie and Wemyss Bay, and is within commuting distance of Glasgow, which is 25 miles away. ## Upper Skelmorlie and North Ayrshire: AdBlue drains across the area Throughout PA postcodes, the vans that cover Upper Skelmorlie — a residential suburb — work the surrounding spots too, Wemyss Bay and Meigle among them. Quickest of all: give a PA17 5 postcode to the van. Shifting the car is not needed. Wherever it sits — beside Wemyss Bay War Memorial, on a lay-by en route to Skelmorlie Golf Club, on a drive — that is where it is drained. Assuming doesn't help at the back of Skelmorlie Castle, on a boundary, or somewhere awkward to pin down; phone and ask. ## In short, for Upper Skelmorlie motorists Before you pour, read the cap. If AdBlue has gone in your diesel tank all the same, leave it off then ring 0333 366 0103. Petrol in Diesel empties it where it waits, anywhere around North Ayrshire.