Yes me too!CitroJim wrote: 02 Feb 2025, 18:18I'm intrigued by AdBlue consumption Matt. Mine seems to use hardly any and in my ownership I've yet to need to top up the AdBlue tank...MattBLancs wrote: 02 Feb 2025, 11:57 Last part of the service, top up of the adblue. Doesn't seem long since I did it, but still swallowed 2.5 litres. Wynns additive also in there too.
Quote me from a while back:
That equates to Adblue consumption of 3,204.7 miles per (adblue) gallon.MattBLancs wrote: 24 Aug 2024, 11:31 Adblue, tank holds 17 litres [ = 3.74 UK gallons ] and the book suggests that's only 12,000 miles worth!
I've topped up again today, 2.5 litres, full now and was last top up too.
140098 miles now, approx 134500 miles last time = 5,598 miles
5,598 / (2.5 / 4.54) = 10,165 miles per (adblue) gallon.
Or, in short, not enough to get a meaningful comparison with the book figures!

So far, chucking it in whenever I get chance. I was very keen to get some of the Wynns anti-crystalisation additive in there, hence brimming the tank (plus enough additive to treat the full 17 litre tank capacity) as soon as I got the car.This week, Diagbox told me I still had 4500Km to go before topping up was needed. I've done around 10,000 miles so far on what was in the tank when i bought the car...
Do you wait for the warning and then top-up or as and when it seems like a good plan?
Servicing this weekend seemed a good opportunity to see where it was up too. Though I said it didn't seem long between fills and I was quite surprised it took 2.5 litres, I'm also surprised it's as much as 5,500 miles covered too!
Yes, Wynn's Crystal Clear and Protect dosed in with the adblue every time is the plan for me.Should we await the warning and only top-up then? Also, do you use any anti-crystallisation additive?
I intend to take the injector out the exhaust for a quick look at some point (a summer job, definitely!) but nothing to suspect impended doom at present!
I've read this thread about tank / pump "failure" (actually proven to be pressure sensor failure) with keen interest:
viewtopic.php?t=81429&start=30
I'm also considering buying the various parts used as the fix and keeping them ready in case I suffer the same fate.