The positive crankcase ventilation valve in your vehicle is a one-way valve that recycles the crankcase gases back to the engine to burn. If you have a plugged PCV valve, you’ll notice a rough idle and poor mileage. It can also create oil leaks.
You see it on light bulbs and plenty of other items but what’s that UL stand for? It stands for Underwriters Laboratories based out of Northbrook, Illinois. UL certifies, validates, tests, inspects, audits, advises and educates and has done so since 1894.
You know it as the cure-all for all things immoveable or getting rid of pests. But do you know what the acronym means? The WD part means water displacement and 40 comes from the number of attempts it took to get the formula worked out back in 1953.