As we just mentioned, your rear main seal is in a place that gets a lot of oil thrown at it and has the added wear of the crankshaft spinning inside of it. The possibility of a very fast leak is the biggest factor that makes it so dangerous to drive with a rear main seal leak. No matter how often you change your oil, eventually the spinning metal crankshaft will wear down the seal enough to cause a leak.
The rear main seal is subject to both high oil pressure since it is right by the rear main bearing as well as the spinning crankshaft which is constantly wearing on the inside of the seal. Some seals and gasket in your engine never cause large leaks because of the design or because they don’t seal a pressurized portion of the engine. Once one of those is removed the oil pan also has to come out so it gets to be an expensive job. To replace the seal, either the engine or transmission will have to be removed. Your vehicle’s flywheel or flexplate is then bolted onto the crankshaft flange sandwiching your rear main seal between your engine and transmission. The rear main seal in your vehicle is at the back of the engine and seals the crankshaft as it exits the engine.
The biggest contributor to the cost of replacing a rear main seal is the location of the seal and therefore the location of the leak. But what makes a rear main seal leak so bad? In this article, we’ll answer that question and help you identify whether or not you’ve got a rear main seal leak in your vehicle. To make things worse, replacing a rear main seal can be one of the most expensive jobs you can do on your car next to replacing the head gaskets or rebuilding your transmission. A rear main seal leak can cause some big problems in your vehicle.
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