![]() ![]() ![]() In the case of N5X engines, a severe oil filter housing leak that can be repaired with a relatively inexpensive gasket can end up costing you thousands of dollars later on or worse, a complete engine replacement. If there’s a small leak I’m not telling you to pull over and get the vehicle towed what I’m saying is what starts off as a small leak almost always gets worse. The takeaway here is that it’s important not to overlook an oil filter housing leak on these BMW engines. There, more likely than not is another damage in this engine based on the amount of debris found inside of it. The amount of debris in the oil pick-up tube likely created an oil starvation issue which eventually led to rod bearing failure. This engine had severe rod knock, and once it was opened up it became pretty clear what went wrong. However, whoever made the repair didn’t bother to inspect as to whether the serpentine belt was sucked inside the engine (they probably thought it was flung off). It appears that a new front crank seal was installed and the oil leak was repaired. Unfortunately, the BMW engine in the photos above suffered this failure. Again, I want to reiterate that this is from what started as an oil filter housing leak. Yes, you read that correctly, and no, I’m not exaggerating it can, in fact, lead to engine failure and you’ll see from the photos an engine that met its demise. This rubber gasket seals the oil filter housing to the cylinder head and is one of the most common sources of oil leaks on most BMW engines where the oil filter housing bolts to the engine block or cylinder head. Now, why is oil filter housing gasket leak this serious of an issue on these engines? Simply put, it can lead to severe engine damage or even failure. If there’s one oil leak on these engines that is critical to address, it’s the oil filter housing gasket. However, they are not engines that do well when the oil leaks are not promptly and professionally addressed. The N 54 and series of engines have been excellent, and very durable, once the oil leaks are handled. I haven’t seen too many higher mileage BMWs that don’t have some kind of oil leak that goes without repair. Oil leaks on any engine are both a nuisance and fact of life but few can cause damage like the BMW oil filter housing gasket. ![]()
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