Super impressed! The product arrived within two days, and Techron continues to be my go-to for keeping my car running smoothly. I’ve noticed real performance benefits, and being able to buy it in bulk makes it even better. Great value and great product!

The best quality of engine cleaner for my car, all the problems for performance now gone.

Restores power and increases mileage!

I have purchased product from Sam's and like some of the other reviews mentioned, when the product arrived at my home two of the bottles had a leak. After looking into it, I found that the leak was because of a manufacturing defect. Under the cap was an aluminum seal that was put on at the manufacturing plant and the sealant leaked around just one small spot on the seal. I was able to gently squeeze the bottle and hear air escaping. I returned the product to my local Sam's and was given a full and complete refund. I continue to order the product from Sam's because of the price and when it arrives, the first thing I do is to gently squeeze each bottle and listen for air escaping. Someone else had mentioned the difference in the amount of product from one store as opposed to another and they just decided that one bottle was less potent than the other I did the math and if you were to divide each bottle buy what it cost to find the price per oz instead of just assuming you would find they were the same price per oz, or at least as close as you can get it being from different stores.

Received shipment of 2 cases of this product and one of the two cases had bottles that leaked and the box was soaked. So I lost approximate 2 bottles, since it was more than just 1 bottle. The seal is not sealing on the lid, thus the leaking bottles . I will not purchase these from SAMS due to this reason.

Shipping is terrible , spill all over in the box.. one don't have a safety silver tap inside and another is loose

The product is great, but every single shipment I’ve received leaked during shipping. The box is covered with the product and it has strong odors.

Sadly, as others have pointed out, the bottles leaked and the box containing them was completely soaked. Not sure how much product was actually lost, but be aware this is not a one-off. Many others have had the same experience.

12 oz — I thought it was a good deal. Each bottle only treats up to 12 gallons of gasoline. The 10 oz bottle at Walmart treats up to 15 gallons of gasoline. In both scenarios, you end up spending about 55 cents for each gallon treated. These bottles are very likely less concentrated.

Good product, but poor execution on the delivery. I received a box that was soaked from the inside. One bottle was busted on the bottom corner and spilled all 12 ounces on the inside of the box.