Bests & Worsts Reviews from Amazon

As an ASE Certified Automotive Technician, I don't discount products that claim some miracles so to speak. You have to read the claims, the direction and the disclaimer. This is no different to all other fluids or chemicals that we use for our vehicles. They all have characteristics and chemical properties. Brake fluids, Power steering, Coolant etc.. These are all chemicals that work based on their chemical properties and features. So is this LUCAS STOP LEAK. This LUCAS stop leak product has been tried and tested on numerous vehicles with leaking and even dripping oil that I have worked on. 100% works on seals that have harden or loosing sealing properties but not on broken ones. People must bear in mind that oil leaking under your car does not always mean it is coming from the oil pan. Just because the oil pan is wet or you can see the oil pan gasket is showing a leaking oil, doesn't mean it is coming from it. Sometimes or most of the time what you see is oil passing through the oil pan side of the gasket from the Main Seal of the engine. Main Seal is round and this is the seal to keep the oil inside the engine to pass through the end of the Crank Shaft Seal (back side of the engine) connected to your transmission via the Torque Converter. Main seal is one of the biggest seals your engine has and the usual and worst culprit in leaks. Another one is the Crank Shaft Seal located in the front of the engine where you see where the biggest pulley of the engine is. If this seal is broken or cracked already, no amount of chemical can stop this from leaking, but if it is only due to loosing its pliability or sealing property, this can be restored by a specialty chemical found in LUCAS stop leak. If LUCAS can stop the leak in this biggest engine seal and considered major engine oil seal then it can cure any seals in the engine that has lost its sealing property (not broken or cracked seals). This chemical is SCIENCE not just a marketing product. It has worked on a 1996 Toyota Camry that I have worked on with dripping oil from the Engine Main seal. I saw how the dripping volume incrementally decreasing every day. The oil leak (drips) stopped completely in 2 weeks. Now it is 2013 and the engine underneath is still dry. Lucas works on different seals such as Crank shaft, camshaft, oil pan and valve cover gasket, o-rings and all other seals inside your engine. When you pour the chemical into your engine, it travels to your oil galleries and through other moving parts and out to wherever your leak is. It will not stop the leak right away but the constant contact of this chemical to the seal causes a reaction to soften it and make it pliable again and thus seals the oil. It is advisable to use this product at least every other oil change to maintain the seals in this soft condition. Otherwise it will harden again and thereby leak again. This is a choice between spending hundreds of dollars in 1 day or 10 bottles of LUCAS oil in the remaining life of your vehicle. Do the math. You will save $$$$$$sss and time. IF it does not work then it is because you have a broken or cracked seal. I have seen how a broken seal looks like. The spring inside the seal that helps to keep the oil in has rotted and broken into pieces, and I have seen a cracked seal also. If this is the case then you have now the option to go the the 2nd scenario- your mechanic comes into play to fix the leak, and be ready for your calculator and withdrawal slip or your ATM Card. SUMMARY: This LUCAS STOP LEAK will not stop leaks on broken or cracked seals. HOW DO YOU KNOW IF YOU HAVE A BROKEN OR CRACKED SEAL? Use this product and if it stops leaking then it is not broken or cracked. It will work 100% on hardened seals or seals that have lost its sealing property. It worked on many occasions in various engines in my experience as Practical & Certified SMART Technician but you have to sustain its use. You have to use benefit-risk analysis if you want to tear down your engine just to replace a $5.00 part and spend hundreds of dollars on an old leaking engine. From 1-10 I give this product 10!!! If you think it is worth to spend hundreds or even thousand dollars to replace all your seals then do it. Because if you will only replace 1 or 2 seals you are just better off spending that money buying the lottery. Changing 1 or 2 seals in an old engine is no different in spending money for nothing. You have to replace all the seals, o-rings, valve seals, cover seals, oil pan, crank shaft, cam shaft, valve stem seals, oil pump seals, VVT gasket or vtec solenoid seals etc.. LUCAS is the way to go. It is the smartest thing you can do to fix that leaking old engine. I have done this work many times in 20+ years and I regret not knowing this product before.