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Your cart is empty.Liqui Moly 3721 Engine Oil AdditiveNo Core Charge RequiredParts Interchange 3721, 3721, 3721, 3721
M. Eisi
Reviewed in Germany on March 1, 2025
Mein Mercedes 200 Kompressor mit 230.000 km schnurrt wie neu. Man merkt die Zugabe sofort .
Namitha Anjaneyaswamy
Reviewed in the United States on February 24, 2025
This has increased my car's fuel efficiency by 2 MPG, cold start vibrations are also noticeable less. Highly recommend for older cars.
Chuck. C.
Reviewed in the United States on September 17, 2024
Recently tried the LiquiMoly 3721 Engine Oil Additive, and I’m thoroughly impressed with its performance. This additive is designed to enhance engine efficiency and longevity, and it certainly delivers on that promise.Just add it to your engine oil. After using it, I noticed a smoother engine performance and a reduction in friction and better gas mileage. The advanced ceramic technology in this additive helps protect engine components from wear and tear, which is a huge plus. Additionally, it has improved my fuel efficiency, making it a cost-effective solution in the long run.Overall, the LiquiMoly 3721 Engine Oil Additive is a fantastic product that lives up to its claims. I highly recommend it to anyone looking to improve their engine’s performance and extend its life.
Iván
Reviewed in Spain on August 25, 2024
Es un aditivo para el motor del coche que viene bastante bien para ayudar a te de menos fricción en las partes móviles, lo que tampoco hay que abusar. Usarlo cada dos o tres cambios de aceite.
Brandon Valus
Reviewed in the United States on August 23, 2024
Works like a charm. I use it every oil change and I’ve got 3 vehicles over 200k miles. I just add a whole bottle in with the new oil. Fuel economy increases are marginal, at best. Don’t expect increased fuel economy. This is to protect your engine and reduce wear. It does a great job at that.
Najia STACHOWSKI
Reviewed in France on August 1, 2024
Très bonne application
Jose Ortiz
Reviewed in the United States on May 11, 2024
It does what it says. My tic toc noise in my 2019 mustang is gone and runs smoother. Very good product highly recommend.
Customer
Reviewed in the United States on December 31, 2024
The only thing I can is that I need to put it twice a year, it's just like magic, makes the engine run smooth (along with propper maintenance, oil filter and a good oil change too) there's no way you can go wrong with this, don't wait too long to try it, I would say it's 100% recommended!
SUBHASH JOSHI
Reviewed in India on December 23, 2024
After use, my XUV 500 has become noiseless.. the engine is very smooth and performance has also increased.
Fabry
Reviewed in Italy on December 12, 2024
Prodotto molto valido .. funziona
HITESH PATEL
Reviewed in the United States on October 3, 2024
I have 2018 Toyota Sienna LE. I just gave a try after changing engine oil, i did use Liqui Molly 5w-20 engine oil and added Liqui Molly Ceratec additives 300ml on top of that. After running approx 50 miles, i notice its very less noisy at 4500 rpm compare to before using this product. I am enjoying ride more now. Before engine was noisy between 3500 and 4500 when we speed up quickly while i am in rush. Now 80% quiet at 4500rpm. I recommend highly. Now i will use in 2011 Mazda CX-7 when time comes to change the engine oil and will share my experience.
Stacey Carrera
Reviewed in the United States on October 25, 2024
This stuff is really great as a friction reducer. In combination with a high quality synthetic oil, I feel like my engine noticeably runs smoother. I've started using it for all of my cars and with every oil change.
ramm
Reviewed in the United States on May 12, 2023
Update 1:3K miles on Honda (41K mileage) - its better than the sound without ceratec in it. For a given car, less sound = less wearR171 - over 2000 miles, great mileage boost. Got back to the manufacturer suggested MPG rating of 24 MPG on highway, a boost from around 19MPG with ceratec and fuel injector cleaner together.Update after 500miles on Honda CRV:Not worried about the fuel efficiency, that's not the purpose of buying this. But fuel efficiency is an indicator of less friction and less wear. Definitely getting at least 1MPG higher, so at least that much frictional force is now avoided in the engine components. So, now I expect the Honda CRV 2017, known for oil dilution to last at least 100K miles. (40K now and 60K more to go).So, planning to use this with every oil change but add only 50ml for 4 gallon oil, to be safe.Pending Update on 3L naturally aspired R171._____Original Review:I got that notorious Honda CR-V 2017 1.5L Turbo, known for massive dilution with it GDI. Will update the review with results if that's affecting, if there is anyone interested to know (give me a 👍 so I know). I should know once I hit 2000miles, the Engine generally becomes ticky. Let me see how that helps.Fill oil to a min level, then added this, ran engine for few mins, topped up oil to get the level close to Max. For now, as soon as I added this with new oil, of course there is a reduction in noise and less ticking. But I don't know yet if that's due to new oil or Ceratec magic. Will update after I clock 2k miles.On my SLK300, 3L V6 naturally aspired engine, there is no noticeable change. I am expecting to see feedback via 0.5MPG increase, probably I should wait for 500miles at least, from what I read from the manufacturer.The bottles had some dings on them, probably not due to Amazon logistics because the paper cover was intact. No issues though.
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