Penetrating fluid is a very low-viscosity oil that’s used to loosen rusted parts like nuts and bolts. It can also be used to prevent corrosion or lubricate mechanical parts. While WD-40 is one of the best-known brands of penetrating fluids, there are many other kinds available, some with specialist applications. Also known as penetrating oils, these products are often seen in garages or workshops, but they’re useful around the home as well. If you’ve got a tricky bolt or a hinge that’s rusted shut, a quick dose of penetrating fluid should be all you need. They’re also available as spray-on aerosols, which can be handy when working in a tight space. Find all the DIY and auto repair products you need at Euro Car Parts. Have a browse in one of our 200 stores around the UK, or take advantage of the great deals on our website - with free UK delivery, buying online has never been more convenient.