Penetrating Oil, 4 Oz.

Almost imossible to find a rusted bolt or screw or other item that Liquid Wrench won't loosen. My go to for 25+ years. Buy it!

Had a squeaky wall oven door hinge, used various products to lubricate the pivot and spring but they didn't last and the squeak returned. This is rated for high heat applications and it stopped the squeak and it did not return even after baking stuff in the oven. Now I'm a happy customer with a quiet oven door!

I had a real difficulty cracking a 36 mm nut that was holding the front sprocket of my motorcycle. The nut had a serious rust and stuck in there and all possible methods I tried failed to free the nut. This liquid wrench freed the nut only after five minutes of application. I was so glad and impressed.

I enjoy working on a lot of DIY jobs around the home… and also tinkering with and repairing older equipment, tractors, and vintage tools. To that end, I really like this Liquid Wrench L104 Penetrating Oil (4 oz. Bottle), because it tends to work where similar other products do not.I don’t tend to use one single product for every situation I encounter because it seems that one product will oftentimes work better in one type of situation than another. I find that it’s a pretty good idea to keep several products on hand for my arsenal.I also use the aerosol version of this product, which is Liquid Wrench L112 Penetrating Oil, and that product performs equally well. However, I actually prefer this smaller, non-aerosol drip bottle version because it allows me to be more precise with its application. I also feel as though I'm getting an even stronger/better product because this bottle contains only the penetrating oil formulation and nothing else such as aerosol propellant. Finally, there's less waste with this drip bottle version because you can apply the oil precisely where you want it to go rather than potentially over-spraying with the aerosol product.What really prompted me to give this LW penetrating oil a try was the mention of it in a report entitled “Testing Different Types of Penetrating Oils” that was published in Machinist's Workshop Magazine (April-May 2007) and frequently referenced online. That report detailed findings from a comparative experiment conducted with the top commercially-branded penetrating oils whereby the force (i.e., pounds) required to loosen rusty test devices was measured. While the clear winner was a homemade 50/50 mix of power steering fluid/acetone mix (53 pounds force), both Kano Kroil (106 force pounds) and Liquid Wrench (127 pounds force) were nearly neck-and-neck behind it. I thought that was pretty impressive, considering Kroil’s legendary reputation and fairly high cost. The other trailing results from that experiment were PB B’laster (214 pounds force), WD-40 (238 pounds force), and No Penetrating Oil at All (516 pounds force).Please note that the report originally specified that a 50/50 mix of automatic transmission fluid/acetone had been used. That caused a lot of confusion, because the photo included in the report showed a bottle of power steering fluid. Subsequently, the report’s author, Lloyd Bender, confirmed in a later issue of Machinist’s Workshop Magazine that power steering fluid is indeed what had been used. So that’s what I correctly reference in the previous paragraph.Fortunately, my local Ace Hardware happens to carry both this drip bottle and the aerosol version so I just purchase it there where both of products happen to be significantly cheaper than what's available anywhere online.For what it’s worth, I’m also a fan of the CRC brand of products and have had particularly good success with CRC Knock’er Loose Penetrant which I use fairly often. But, as I’ve already mentioned, LW tends to work best for me when I have something that just won’t budge, regardless of what else I’ve already tried. Also, according to the LW website, LW is safe on most plastics (test a small area first), unlike Knock’er Loose which is not plastic-safe. I've experienced some unfortunate instances in the past whereby I've irreversibly damaged some adjacent plastic material by using an inappropriate penetrant, lubricant, etc., so I now always verify plastic-safeness before using anything.

You might be amazed at what I have been able to get undone by just applying it to cold and to heated metal situations. This is one of those things, "My dad used it and now I am using it" Used it on bolts, nuts, black and galvanized pipes up to two inches.

Loosens rusted bolts like nothing else.

Nobody cares about the warmth of this oil, it’s not massage or tanning oil! It does do a great job loosening tight or rusted fasteners. Ergo the name Liquid Wrench. A great, Go-To product. Shipped fast. Thanks.

I only wish that I had purchased an aerosol version of this so that I could apply it onto under surfaces, upside down, but that's my fault for not thinking ahead. As it stands this will probably last until I croak.