The oil filter housing is pretty self explanitory; It holds the oil filter assembly. Not only does this provide a small amount of cooling but it makes the filter much easier to service.
If you have noticed a mixture of coolant and oil, have consistently suffered from unexplained coolant loss, or if your BMW's engine has higher mileage, there is a good chance that your factory plastic oil filter housing has cracked and/or failed. The URO oil filter housing and cooler is a complete replacement of your factory unit, which eliminates the possibility of failure due to weak materials.
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