Wynn's Crystal Clean & Protect - Additive for Use with AdBlue® - Prevents Crystallisation in SCR Systems - Enhances Diesel Emission Control Performance - 125ml

Works like magic. I had one of those dreaded warnings come up to service urea system and given 700 miles until the car would not start. I poured 1 bottle of this into the Adblue tank and drove 10 miles and it cleared the crystalized injector and warning was gone. Avoided a hefty repair.

I have a Mercedes GLE with a 32 litre Adblue tank. I added this to an approximately 2/3rds full tank, so slightly under dosed (product is meant to be for 15L). Car has 70,000 miles on the clock, so wanted to start cleaning the components, to try and prevent costly repairs (which anyone with a Mercedes will know can be extremely high). I can’t say it made any difference to the drive, or noticed any exhaust difference, but I was using this as preventative rather than cure. The price is very reasonable for peace of mind. Adblue additives are becoming much more common now (if you read motoring forums). Despite an earlier review saying it destroyed their Mercedes SCR system, it seems to be ok in mine. I regularly used Wynns diesel additives, so trust this brand a lot. Their products are very good overall, and they have been around for a long time, with mainly 5 star reviews. Seems like a good product, and hopefully it will clean the Adblue/SCR system, and prevent problems. I will be using with every Adblue top up going forward.

Good

I have been plagued with AdBlu messages for the past 9 months. Every day I was getting a variety of different messages, despite having a full tank. It would count down to 500 miles to go and then go to 700 miles, then 1500 miles etc etc. And sometimes I would get the Urea message too and/or Engine Failure and/or Emissions Fault etc etc. I stumbled on to this, and decided to give it a try. After 10 days I still had messages, so I booked it in to a garage, but they had a two week waiting list. While waiting the two weeks, all the messages have now completely gone. So I have now cancelled my garage visit and I am keeping my fingers crossed! I think it took about 3 weeks and 400 miles of driving. The garage advised me that it is possible to buy Adblu that contains an anti crystallisation additive, although I will probably continue to use this stuff. If the messages come back, then I will update this review (and book the car back into a garage!)

Excellent additive for AdBlue . I found this additive giving very good protection especially during the icy months in winter.

I'm not an expert by any stretch of the imagination and so I can only state the following: My 2021 Vauxhall Combo, when bought, (13th December 2025) had 41000 on the clock. Adblu was showing 1700 until no start. At the end of March 2026 an on board message reported 1500 until no start. 1500 is the usual number when messages start showing. I added 10 ltrs of adblu. 2 weeks later, the adblu message was still coming up at engine start. Doing some research, I chose Wynn's additive and one week later the 1500 dropped to 1300 and then went back up to 1700. I can only assume that Wynn's, like any additive, took time to remove possible crystallisation around jets and sensors. One bottle, (125ml) treats 15 ltrs, the Vauxhall Combo holds 17 ltrs so I can only wait now until the next 1500 warning, add the 10 ltr adblu plus Wynn's Crystal Clean and Protect and see how long it takes to register. Just so you know, I also use Reddex in my Diesel.

Keeps Ad blue system crystal free. So far it’s kept Ad blue issues at bay

Very good, reduced crystalisation on my ad blue engine.

Muy buen producto,65000 km con él y de momento el sistema de adblue no me ha dado fallos. pero tengo una duda, qué diferencia hay entre este y el del bote morado de la misma marca ?

Cosa dire … questi prodotti sono difficilmente valutabili in quanto la loro efficacia è spesso la risultante di un continuo utilizzo fino a quando i sistemi scr non vanno in panne ossia dopo i 200.000 km circa . La mia recensione si basa sul fatto che quasi tutti i meccanici che conosco mi hanno consigliato esclusivamente questo prodotto, che sto usando seppur la mia vettura sia piuttosto giovane quindi la vera efficacia non è ancora valutabile

Mein Citroen Berlingo zeigte mal wieder die Adblue-Lampe und ich habe beim nächsten Tanken auch Adblue-Flüssigkeit vollgetankt. Danach ging allerdings die Adbluelampe nicht aus, es kam die Meldung 'in 1000 km kann der Motor nicht mehr gestartet werden'. Das zählte alle 50 km weiter runter und es kam zusätzlich die Motor-Lampe. Mein freundlicher Werkstattmeister sagte, dass bei diesem Typ sehr oft in diesem Fall der Adbluetank getauscht werden muss, der kostet so etwa 1000 €, weil da die Punpe und die Elektronik mit dem Tank eine Einheit ist, plus seine Arbeitskosten. Er stellte mir die Fehleranzeige wieder zurück, um mir Zeit zum Nachdenken zu geben. Am nächsten Tag ging allerdings der Countdown auf dem Display wieder los. Einem Tip aus einem Forum folgend habe ich mir angeschaut, welche Lösungen es für solche Fälle gibt ... und landete bei Adblue-Zusatzflüssigkeiten, die das Auskristallisieren von Adblue verhindern sollen und sogar die Kristalle wieder lösen sollten. Mir fielen da zwei Mittel auf, deren Hersteller mir seit Jahrzehnten bekannt waren: Wynn's und Liqui Moly. Beide gibt es bei Amazon und ich bestellte beide. Der Unterschied: Wynn's kommt in einer kleinen 125ccm-Flasche mit langem Hals, praktisch fürs Einfüllen, und empfiehlt den ganzen Inhalt auf einmal in den Adblue-Tank zu kippen. Die Anderen empfehlen jeweils bei jedem Tanken nur 25 ccm. Meine Strategie war ganz logisch: ich wollte zunächst Wynn's Tinktur ausprobieren und wenn das nicht hilft, in der praktischen Wynn's-Flasche die andere Tinktur nachkippen. Zu Letzterem kam es dann allerdings nicht mehr: Wynn's Cristal Clean & Protect reingekippt, zur Autobahn gefahren und dann nach etwa 5-7 km ging die Adblue-Lampe aus! Am nächsten Tag bei einer längeren Dienstfahrt ging dann nach 20 km auch die Motor-Lampe aus. Und blieb aus! Die kleine Wynn's-Flasche kostete mich übrigens weniger als ein Fünftel von dem Rechnungsbetrag, den mein Werkstattmeister fürs Zurückstellen der Fehleranzeige verlangt hat...

Snabb leverans

waste of time