Dexcool coolant brown8/16/2023 ![]() ![]() DexCool solved the repeated water pump seal issues that existed in the very early days of the liquid cooled engines. Rotax also uses a ceramic water pump seal that has no issue with DexCool.įor the most part most Rotax service people are told to recommend DexCool as the 5 year life matches the hose replacement times. GM still uses DexCool and changed a lot of the parts in their engines to solve the issues they had from the late 1990s and early 2000s. It is good for 5 years (originally GM said forever but they were overly optimistic) Your Rotax has no internal plastic bits to dissolve in the cooling system, you do have to think about the OEM supplied parts to be sure) The aluminium parts will take on a dark grey appearance after running OAT and I have not seen any scale or buildups even after many years of running in any engines even after multiple TBO times have been reached. Any company that sells coolant if they label it DexCool it is from the original formula. (plastic in gaskets were hard hit) Even with that GM still sells its branded coolant with DexCool. ![]() GM users found that some parts within their engines would dissolve leaving a sludge of brown material that did a lot of damage. The issue with some of the lawsuits stems from the incorrect use such as incorrect mixing. We know that there is nothing within the supply scope of the Rotax engine that it will harm however other bits you can't be sure of. Any water added must be distilled water only and never tap water.ĭexCool is an OAT, Organic Acid Technology as Bill pointed out, as such it must be tested by the OEM on the OEM supplied parts. (582 and 912) Clearly if you have the DexCool forming a gel or solid it was not prediluted as it should be. Give us a call today at Beyer Motor Works.I was involved with some of the original testing of DexCool in Rotax engines. Upon further inspection we can help you determine if there is more serious cause of the buildup and catch it before it causes a more serious problem in your engine. These are just the main causes of the slime or sludge that builds up in your radiator. You will need to have your system flushed properly when the intake manifold gasket is repaired, the oily sludge left behind can cause costly damage to the cooling system. In this case, the cooling system is not to blame. Intake Manifold Gasket – When the intake manifold gasket leaks, some oil can run into the cooling system creating sludge in the coolant. We suggest if you see this sludge build up in your vehicle to take it to a professional for a chemical flush. Only a chemical flush will remove the sludge. The residue left behind by the breakdown is very sticky and thick like mud. According to complaints received by Consumer Affairs, Dex-Cool reacts with the plastic sealing surfaces, causing the intake manifold to leak. Unfortunately, this new technology hasn’t worked entirely to the desired design purpose. ![]() This coolant was designed to last longer than normal antifreeze, only needing to be changed every five years instead of two. If left untreated, overheating and leaking can lead to very expensive repairs.ĭex-Cool – Some vehicles require a coolant called Dex-Cool. This sludge can block the flow of coolant through the lines which causes the engine to overheat and leak. Once the corrosion begins, rust, sludge and scale build up through the entire cooling system, including into the engine. As it degrades, coolant loses its protective qualities, PH levels change, and corrosion sets in. Radiators, like most parts in your engine, are made of metal. A breach in the system can contaminate coolant with transmission fluid.Ĭorrosion – this is the most common cause of sludge build-up in a radiator. Vehicles with automatic transmissions, the engine-cooling system cools the transmission. Mixing of mismatched coolants can cause the additives to “drop out” of the solution and form sludge or slime.Ĭontaminated coolant – a bad head gasket or cracked cylinder head can allow oil and coolant to resulting in sludge. These additives are supposed to guard against corrosion, cavitation and scaling. The base of the coolant is primarily responsible for providing a protection from freeze and boil-over. Since one of the leading causes of roadside breakdown is cooling system failure, pay attention to the condition of your radiator.Īdditives – coolant consists of a base (typically ethylene glycol or propylene glycol) mixed with additives and water. However, your engine probably overheated because of sludge build-up. You might have noticed it now that you noticed your engine has been overheating. Have you seen sludge? That thick, brown-colored substance you can see after you open the cap on your car’s radiator. ![]()
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