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| lightning Member Since: 23 Apr 2009 Location: High Peak, Derbyshire Posts: 3329  
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You can top it up if you want, but with 6,000 miles of range remaining it's not necessary.
lt's fine to use any Adblue and mix it with whatever is already in there. What you don't want to do, is let it run out as the engine won't start once the Adblue is empty. l believe you get a warning on the dashboard when it's down to 1,000 miles of range. Maybe top it up then. Some have also reported issues if you overfill the Adblue tank, although l don't know why that would happen. Last edited by lightning on 10th Aug 2025 10:58am. Edited 1 time in total |
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10th Aug 2025 9:40am |
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| L3785 Member Since: 08 Oct 2024 Location: Yorkshire Posts: 59
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That’s really useful advice, thanks so much.
I’ll get it topped up at 10,000 miles with the oil change on that basis, cheers 👍🏼 2025MY Defender 90 D250 X-Dynamic HSE | Santorini Black with Black Pack |
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10th Aug 2025 9:43am |
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| ruben Member Since: 04 Feb 2021 Location: ASTURIAS Posts: 362 
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Hi, One more detail is missing! It's also not advisable to leave it or push it to very low levels. It seems to be necessary not to have too much air inside. If the tank is too empty, the oxygen encourages undesirable crystallization of the urea, which leaves residues in the tank, a potential source of problems with the AdBlue sensors and injectors. This is why the car sends such early warnings. What I do is put in 1 liter less than what the car asks for. When it needs a refill, it tells you the number of liters needed. So that's what I do, but subtract one to avoid overfilling. If it asks for 6 liters, I put in 5. bye!! Defender 110 SE I6 D250 23MY
ExDiscovery 3 TDV6 SE |
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10th Aug 2025 9:59am |
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| Clemmo Member Since: 03 Aug 2012 Location: Mile Oak Posts: 1271 
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The issue with overfilling is also due to crystalization of the Adblue.
At the top of the filler neck there is an air hole which is prone to blocking following an overfill. The key is to not allow the Adblue to backwash..use the filler neck provided and get it pushed right down the tank. Put in less than you think you need. It lasts very well anyway  |
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10th Aug 2025 10:39am |
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| lightning Member Since: 23 Apr 2009 Location: High Peak, Derbyshire Posts: 3329
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Do you think it's okay to leave it until the warning comes up at 1,000 miles range remaining?
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10th Aug 2025 10:59am |
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| ruben Member Since: 04 Feb 2021 Location: ASTURIAS Posts: 362
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I would say NO, not is a good idea! I try to fill it up when it asks me for the first time, minus a liter, so it's always between 60 and 90%. or so!! Defender 110 SE I6 D250 23MY
ExDiscovery 3 TDV6 SE |
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10th Aug 2025 11:18am |
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| Clemmo Member Since: 03 Aug 2012 Location: Mile Oak Posts: 1271
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Absolutely..this gives you plenty of time. You really need to be filling with AdBlue the absolute minimum of times. ~So run to warning..get product..add within 500 miles..dont overfill..( no splash)
Only use fresh Adblue. Do not store it past 6 months once opened. Store in cool dark space. Be wary where you buy it from...look how it is stored? Many Forecourts have it stacked up outside in bright sunlight which rapidly degrades the product. It has to be stored below 21degC. https://www.fleetalliance.co.uk/blog/dos-donts-using-adblue/ |
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10th Aug 2025 12:15pm |
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| Fifth Horseman Member Since: 08 Mar 2011 Location: Lanarkshire Posts: 339 
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The AdBlu tank is 20L (about 4.4 gallons (UK)) so its still well over half-full.
Also there have been instances where overfilling has confused the level sensor leading the system to think the tank is still empty. As most of the refi containers are 10L I'd wait until it says "Refill 2.5 gallons" and then chuck a whole 10L container in. Defender 110 D300 X-Dynamic HSE MY22 Defender 110 Station Wagon 2011 (gone) Defender 110 DCPU 2007 (gone) |
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10th Aug 2025 6:02pm |
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| ruben Member Since: 04 Feb 2021 Location: ASTURIAS Posts: 362
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Mine, so far, has only notified me of refills a couple of times, here we don't use gallons, but liters, and both times it always asked me for 6 liters of AdBlue at the first warning, given that around here you usually see 5-liter bottles, so it's perfect to obey the first message with a full bottle, which leaves you a margin of 1 liter that avoids the risk of overfilling, and it doesn't warn me again and that's it, so the same things in different worlds, nothing more! Defender 110 SE I6 D250 23MY
ExDiscovery 3 TDV6 SE |
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10th Aug 2025 6:31pm |
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