BestLine Racing - Engine Oil Additive for all Gas & Diesel Engines - Reduces Wear, Noise, Vibration - Boosts Fuel Economy & Horsepower - Made in the USA, Treats 5-quarts of oil.

This stuff is magic in a bottle. It will save you so much money in both the short term, and the long term. We are going to get in to the nitty gritty with the GOOD, BAD & the UGLY. Let's do it!Disclaimer: This was used in a Toyota Prius Gen 2 2004-2009GOOD:Treats your engine, and treats it wellIdling is smoother than butter (engine idles quietly, even in cold temperatures)MPG increase (Instantly got an increase of 5+ mpg, even with heat on all winter)The Savings!!! (This with a conventional oil change costs 60 in total versus getting a full synthetic oil change which runs 85+)Engine runs extremely cool and quiet even with highway miles at 60+ mphEverything goes quiet the minute you add it and drive about 20 miles (no knocking sounds, friction noise, rough idles, nothing O.O)Made in the USA (quite the shocker to see these nowadays, especially effective products O.O)BAD:Expensive (this is when you compare to other fuel additives but overall, it is still priced competitively)UGLY:The opening is funny to pour from, not really a problem if you have a funnel, but keep this in mind if you are pouring without one.Overall, this product is blazing hot Doritos and then some. You are saving money, cleaning your engine, getting rid of existing problems, and giving your car new life. All while getting the cheapest oil change and adding this simple additive. You can't go wrong with this product. Stop reading, buy immediately, and bring new life to your engine!

So I bought this product about a year ago on a whim, I don't even remember how I found it now. We have a 2008 Ford Crown Victoria police interceptor with 166,000 miles. It does not get used much anymore, actually in the past year we've only driven 2,000 miles. I noticed a couple of years ago that the first few seconds of cold startups there was a rattle from the timing tensioner (very common on the 4.6). It would go away after a few seconds but very annoying, and may cause wear overtime.Enter Bestline - added a full bottle at oil change. Literally within the first two days I noticed there was no more timing chain tensioner rattle! I couldn't believe it but here we are a year later with the same results. I haven't kept good track of mileage over the last year due to the low usage I don't often fill up the car all the way.Changed the oil a few months ago in our 2018 Mazda CX-9 turbo and decided to give this a go with minimal expectations as it runs very well, currently has 58,000 miles. The motor ran well as it did before, but the surprise came on the first cold start here in Iowa winter. I immediately noticed that in very cold temperatures, there was substantially less vibration on cold start. One other thing to note, at first I did not think that the mpg was affected. However now with almost 5,000 miles with the best line, when the conditions are the same it is definitely improved. I use the Fuelly app so it's easy to track the mileage. In the last 10 fill ups my average is up about 1 mile per gallon. Previously, when I drove 100% City mileage, the Mazda averages between 17 and 19. But the last two tanks have been 21.3 and 20.8 respectively. Highway would be a great test that's the best I've gotten before was 28, will have to test in the future. I'm not sure if this product needs time to do its thing? But we'll see if this trend continues.Needless to say, I was pretty skeptical but will keep using Best line in all of my gas powered vehicles 👍

Great product!Quiets the engine doneEven noticed engine ran cooler less frictionPut in Vette and Truck

I have used this on three different cars. A 2001 Lexus RX 300 sold with 200k and buttery smooth engine, a 2010 Mazda 6 sold recently with 98k again engine solid and smooth, 2019 Hyundai Santa Fe with the 2.4l Thetha II engine. Bought that Hyundai with 11 miles and since day one I have been using this product now going on 118.5k the engine still going strong, no sludge, no oil burning, no compression issues and no issues to report. I have put that engine to thousands of miles from West to East coast multiple times. Still going strong and hope it hits that 200k without issues. I happily recommend this product it seems like the engine is quieter, smoother on cold starts and the engine temp doesn't seem faced no matter the Summers in the Southern U.S.

I love this product for all of my vehicles to keep their engines running clean and at peak performance. That being said, the way they are packaged and shipped needs improvement. My latest purchase of this treatment sent the bottles in a thin parcel with no support or padding around the bottles. One of them either got punctured or loosened up in transit and leaked a few tablespoons of fluid inside the plastic wrap around the bottle and some of it leaked further to get soaked into the parcel too. Luckily I picked it up as soon as it was delivered, but this type of leak poses a fire hazard in my apartment’s mail room and a slip hazard if it had leaked further onto the floor at any point.

Works well. it quiets everything , seems to run smoother, less vibration, More power and better gas milage. All of this = less wear and longevity.

I was skeptical ....but it smoothed out a rough running engine.could feel the lubricity working..better gas mileage behind it.

Great product that does what it says! I use this in most of my cars, trucks and boat!