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❄️ Keep your diesel running crystal clear — because downtime is so last decade!
Wynn's Crystal Clean & Protect is a 125ml additive designed to prevent AdBlue crystallisation in diesel SCR systems. By dissolving early crystal deposits in injectors, pumps, and tanks, it maintains optimal system performance, reduces emissions, and prevents costly repairs and downtime. Compatible with all AdBlue and DEF systems, it treats up to 15 litres per bottle and is easy to apply during refills, making it an essential maintenance product for diesel vehicles and commercial fleets.

















| ASIN | B0BV7BNHDT |
| Best Sellers Rank | 160 in Automotive ( See Top 100 in Automotive ) 8 in Fuel Systems |
| Brand | Wynn's |
| Customer Reviews | 4.6 4.6 out of 5 stars (2,188) |
| Date First Available | 8 Feb. 2023 |
| Item model number | 21002 |
| Manufacturer | Wynn's |
| Manufacturer part number | 21002 |
| Model | AdBlue Crystal Clean & Protect - 125ml |
| Package Dimensions | 31.8 x 21.3 x 4.4 cm; 0.14 g |
R**T
This stuff is worth its weight in gold!
This stuff is amazing. Had the dreaded Adblue system failure message on my BMW 520d. Read other reviews saying it cleared up error messages. Didn’t hold much hope but thought I’d give it a whirl. Added 2 bottles to a full tank of Adblue. It took some time (about 3 months) but one day I switched the car on and the persistent error had gone and no longer any engine light! Will use this now every time I top up the Adblue to keep the crystallisation at bay. Worth its weight in gold!
M**E
Seems to have done the trick
Unstuck the level. The AdBlue level didn’t increase till I added this, then only gradually. Not sure it was this that cured it, but seems to be showing AdBlue level correctly now!
M**S
Item as described
Item as described. Quick delivery
M**I
It works like magic.
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.
W**M
Excellent
Excellent cleared the dreaded area and engine fault on my 2016 Peugeot 2008, been 4 months now and lights have stayed off and sailed through mot emissions test
P**S
Great would buy again
Great not using as much adblue on my taxi’s would recommend
A**X
It really works! A must-have for AdBlue diesel engines!
I used this additive for my Peugeot 3008 Diesel, which is known for having a rather sensitive AdBlue system. Before using Wynn’s Crystal Clean & Protect, I kept getting error messages and warnings related to the emissions system. After adding this product regularly, the issues stopped completely. The system ran smoothly without any faults. This is one of the few additives that actually delivers real results. It helped keep everything clean and running properly - especially on long drives. I’ve since sold the car and won’t be going back to diesel again, but this additive was an absolute lifesaver while I had it. Highly recommended!
K**H
DOES WHAT IT SAYES IT WILL DO
DOES THE JOB
C**A
Ottimo
L’ho acquistato perché la macchina, quando entravo in funzione il sistema di AD blue alcune volte mi dava degli allarmi sul quadro strumenti dovuto a un basso livello di temperatura raggiunta, perché appunto la quantità di AD blue che veniva iniettato era insufficiente, quindi ho supposto che si fossero creati nei cristalli nell’impianto in quanto io ho la macchina di Bu da poco e non sapevo la necessità di aggiungere degli additivi in modo che il liquidò non cristallizzasse, quindi l’ho usato con molta paura anche perché avevo paura che i cristalli potessero comunque intasare completamente il iniettore una volta che questo additivo entrava in circolazione e faceva smuovere i cristalli, appunto però nel mio caso tutto è andato alla perfezione, quindi penso che questo additivo abbia sciolto completamente tutti i cristalli e che l’impianto si sia liberato senza comunque avere poi più allarmi quindi molto contento di questo prodotto ovviamente è un po’ più caro però nel mio caso ha risolto i problemi, quindi continuerò ad usarlo
A**E
100% Kaufempfehlung!!!
Bei mir hat sich über die Jahre die Zuleitung zum AdBluetank zugesetzt. Beim letzten Mal habe ich gute 30 Minuten benötigt um 10L AdBlue nachzutanken. Jetzt beim Befüllen war die Zuleitung komplett verstopft. Glücklicherweise habe ich zuerst das Additive direkt in die Zuleitung gefüllt. Anschließend AdBlue obendrauf, in der Hoffnung wieder AdBlue tanken zu können. Das war jedoch nicht der Fall, Zuleitung war noch immer verstopft. Gedanklich war ich schon dabei die Zuleitung auszubauen und zu reinigen. Habe 24h später einen neuen Versuch unternommen AdBlue nachzutanken, und siehe da es hat funktioniert! Dieses Additive hat tatsächlich die Kristalle/Verstopfung aufgelöst, ich habe noch nie so schnell AdBlue tanken können. Werde mir das Additive definitiv nochmal kaufen und beim nächsten Tanken nutzen. TOP, TOP, TOP absolut empfehlenswert!!!
N**D
Bra product
Snabb leverans
K**C
waste
waste of time
E**N
Aditivo muy útil para mantener limpio el sistema AdBlue y evitar problemas
Compra muy recomendable para vehículos diésel con sistema AdBlue, especialmente si quieres prevenir problemas y cuidar el sistema SCR a largo plazo. Compramos este aditivo de Wynn’s para utilizarlo como mantenimiento preventivo y la verdad es que transmite bastante tranquilidad en vehículos modernos diésel. Lo primero que destaca es que está pensado para ayudar a prevenir la cristalización del AdBlue, uno de los problemas más habituales en sistemas SCR con el paso del tiempo. En nuestro caso empezamos a usarlo de forma preventiva después de leer bastante sobre averías relacionadas con cristalizaciones y obstrucciones. El uso resulta bastante sencillo y el formato de 125 ml es cómodo para añadir directamente al depósito siguiendo las indicaciones. Otro punto positivo es que ayuda a mantener el sistema más limpio y favorece un funcionamiento más estable del tratamiento de emisiones. Además, al tratarse de un componente importante y caro en muchos coches diésel modernos, cualquier mantenimiento preventivo se agradece muchísimo. También nos gustó bastante que no requiere herramientas ni procesos complicados. El producto transmite buena sensación de calidad y la marca es bastante conocida en aditivos para automoción. En cuanto a resultados, obviamente no es algo que se note de forma inmediata como otros productos, pero sí aporta tranquilidad para el mantenimiento del sistema. Otro detalle importante es que puede resultar especialmente útil en coches que hacen muchos trayectos cortos o urbanos. Pros: * Ayuda a prevenir cristalizaciones del AdBlue * Fácil de utilizar * Formato práctico * Ideal como mantenimiento preventivo * Puede ayudar a evitar averías costosas * Marca conocida en automoción * Compatible con vehículos diésel SCR Contras: * Los resultados no son inmediatos ni visibles * No sustituye un buen mantenimiento del vehículo * Conviene seguir bien las dosis recomendadas Conclusión: Un aditivo interesante para quienes quieran cuidar el sistema AdBlue y prevenir problemas a largo plazo. Fácil de usar y recomendable como mantenimiento preventivo en vehículos diésel modernos.
Trustpilot
3 days ago
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