Best Engine & Oil Fluid Additives of 2026

"As someone who's always worked on their own cars, I was skeptical about this product, especially after finding it on social media. But after using it in my 2003 Trailblazer with nearly 200k miles, I noticed the cold start lifter noise was reduced by 90% and the warm lifter tick disappeared completely. It even seemed to give my engine better throttle response and a bit more power. It's not cheap, but the results are worth it."

"When I added just 3oz to my Silverado's transmission, the persistent shudder stopped immediately—even after previous tunes hadn't helped. Mixing it into my engine oil made my engine much quieter and smoother. I've tried similar products before, but this one is far superior and great value for money."

"With my 2024 Mustang GT, I saw an instant 4mpg boost and a much quieter engine at idle and deceleration. The car also felt smoother overall. I usually expect these products to be useless, but this one really delivers results."

"After adding this treatment, I noticed my engine runs much smoother and quieter, especially during cold starts. The improvement in performance and reduction in friction is real. Liqui Moly stands out as a quality brand—I’d strongly recommend this to anyone who wants to extend their engine’s life and boost responsiveness."

"As a professional mechanic and lifelong car enthusiast, I trust Liqui Moly products completely. The MoS2 anti-friction treatment noticeably silenced timing chain noise on my high-mileage car and made the engine smoother. The value is unbeatable compared to other additives, and it works well in both German and domestic vehicles. This is a reliable, effective solution for long-term engine care."

"I’ve tried plenty of engine additives, but Liqui Moly MoS2 really stands out for making my engine run smoother and quieter, even at higher RPMs. I’ve also seen about a 10% improvement in fuel economy, which helps offset the cost. This product clearly reduces wear and prolongs engine life, making it a smart investment for anyone who cares about their vehicle’s health."

"After adding LIQUI MOLY Cera Tec 3721 to my 2016 Mustang Ecoboost, I experienced a remarkable reduction in engine knocking and overall noise. The engine runs far smoother now, and I'm also noticing better fuel economy on my road trips. As someone passionate about both cars and technology, I truly appreciate the science-backed protection this additive offers. Highly recommended for anyone wanting to extend their engine’s life."

"I used Ceratec for my Mazda 3 Turbo during its first oil change, mainly because it doesn’t darken the oil like MoS2 and is thus better for warranty purposes. Valve and lifter noise disappeared almost instantly, and the engine now idles so smoothly it’s almost silent. The difference in how it revs is night and day. While it’s a bit pricey, I see it as cheap insurance for long-term engine health."

"El producto es excelente para el mantenimiento del motor. Después de añadirlo, noté que el motor funcionaba mucho más suave y con menos ruido, y la aceleración se volvió más fluida. Es muy fácil de aplicar y claramente ayuda a proteger contra el desgaste. Sin duda, repetiré la compra para mantener mi motor en óptimas condiciones."

"After adding Lucas Oil 10001 Heavy Duty Oil Stabilizer to my car, I immediately noticed a smoother ride and much quieter engine operation. Even with my older vehicle, this product has been a game-changer for performance. It's now something I always keep on hand for routine maintenance."

"I have been using Lucas Oil Stabilizer in all my vehicles and I truly believe it's what keeps my engines well-lubricated and running smoothly, even after 100,000 miles. I especially appreciate the protection it offers on cold starts and the fact that there's no engine knocking. It's a staple for every oil change."

"This oil stabilizer really transformed my Chrysler 300, making it super quiet during cold starts. Now I use it in all my cars with every oil change. The difference in engine smoothness and noise reduction is incredible. I can't imagine driving without it anymore!"

"I've tried many products, but this one truly stands out for improving my BMW's engine performance. After using three bottles, I noticed quieter operation, better fuel economy, and increased power. The difference was clear after just the first tank. I trust this brand so much now, I'm planning to try their engine flush next."

"I regularly use this on my MBZ, and it keeps my injectors and chamber spotless. I only need to apply it twice a year for perfect idle and instant acceleration response. It's a real value compared to other options, and for me, it's priceless for long-term engine health."

"After three cans in my tuned BMW with full bolt-ons, my engine runs noticeably smoother at all RPMs. It's excellent for preventative maintenance—I just add it before each fill-up. After a few tanks, the improvement is obvious."

"I was able to find a transmission leak with this oil dye. It worked exactly as promised and was absolutely worth the money. I just used a UV flashlight I bought separately and the leak became visible."

"This dye made it simple to pinpoint a stubborn oil leak in my car. I added it, drove a bit, and then used a black light to trace the leak, which turned out to be higher up than expected. Saved me from unnecessary repairs."

"I used this product to diagnose a fuel leak in my carburetor, and just a drop in a small amount of fuel made the leak glow brightly under UV light. It revealed a small leak I never would have seen otherwise."

"After using Archoil AR9100, I've noticed significantly smoother engine operation, quieter startups, and improved fuel economy in my vehicle. The oil stays in good condition longer, and even though it's a bit pricey, the performance gains justify the cost for me."

"When I added AR9100 to my 6.0L Powerstroke, I immediately felt easier cold starts and a much quieter, smoother-running engine. Even in cold weather, stiction and power loss are no longer issues. I've tried other additives but AR9100 clearly stands out."

"Nothing else I've tried has tackled my diesel's stiction problems like this product. It even made my turbo spool more quickly, which was surprising and impressive. Highly effective for tough injector issues."

"After using this on my Subaru Forester with 95,000 miles, I noticed no more oil drips or noticeable oil loss between changes. It worked far better than I expected—a quick, budget-friendly solution that really delivers. I’ll definitely try it on my other high-mileage vehicles before considering costly repairs."

"My Ford Ranger from 1990 had five different oil leaks—the worst from the oil pan gasket. After adding Liqui Moly Oil Saver, the leaks have nearly vanished; just a few drops after 100 miles, compared to soaked paper towels before. The oil feels a bit thicker now, and I’m truly impressed with these results. I highly recommend this product for anyone dealing with oil leaks in older vehicles."

"With over 220,000 miles on my 2012 Chevy Equinox, I was burning a quart of oil a day. One week after using Liqui Moly Oil Saver, I’ve only topped up half a quart and the engine has stopped smoking. Even the gas mileage is improving—hoping the results last!"

"I've been using this oil stabilizer for several years in my vehicles. After adding it, I've noticed my engines run smoother and quieter, especially during cold starts. The annoying dry mechanical noises that used to bother me are gone completely, and even after long periods of non-use, the engine starts up without a hitch. While I haven't seen a big change in gas mileage, the elimination of dry starts alone makes it worth it for me."

"As recommended by my mechanic, I started using Lucas synthetic in my car and immediately noticed smoother performance and improved gas mileage. I usually add about 20% of my oil capacity with this product and have never run into any issues. My vehicles have never run better since making this a regular part of my maintenance."

"I use Lucas in all my 4-stroke engines and have found it increases fuel efficiency and keeps the engine running quieter. It’s helped keep my engines clean and free of leaks, and even stopped seal smoke. Just add it in and enjoy the results."

"I used this product when my 2008 Toyota Avalon had a major power steering leak, and I was amazed by the results. After adding it, the leak nearly stopped completely, and I haven't needed to top off the fluid for two months. I know it can't fix broken seals, but for minor leaks it works wonders. I’m definitely planning to use it on other issues as well."

"My experience with ATP AT-205 Re-Seal has been outstanding. It fixed a small oil leak on my vehicle, and then worked just as well on a power steering leak. I was impressed by how easy it is to use and how quickly it acted. It's become my go-to for minor leaks—no need for expensive repairs right away."

"I’ve applied AT-205 on my 2007 Honda Odyssey to address oil leaks, specifically on the spool valve and rear main seal. It’s kept the leaks under control, especially for everyday driving. On the highway at high RPMs, there’s a slight leak, but it’s much less than before. This product has saved me a lot of trouble and money."