When trying to locate the source of an oil leak always start at the top of the engine locate any oil covered areas the cleanest oil covered area is likely the source of leak.
E90 oil filter cap leak.
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Seal deteriorating and oil leaking onto manifold.
Bmw e90 e92 oil filter housing gasket replacement 2007 2012.
Rather than costly repairs use this guide to save yourself immeasurable amounts of headache and money.
If your oil filter housing is leaking on your n51 n52 n54 or n55 bmw engine you need to take care of it as soon as possible.
Bmw e90 335i oil filler cap leak.
If it s left unattended it is known to result in catastrophic failure.
Both where you add oil and where you drain oil could be.
If you notice oil starting to build up around the top of the oil filter or leaking from the top this may be the source of your oil leaks.
I m not going to get into these two common issues too deeply because both of these leaks are not just common on e90s they are extremely common on every 3 series i have ever owned.
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You will need the oil filter housing profile gasket and housing fasteners.
Oil leaks valve cover gasket oil filter housing gasket.
Valve cover gaskets are cheap and easy to replace.
A leaking oil filter housing is a very common problem with bmw n52 engine.
An oil filter that is too small can cause the threads or the seal on the oil filter to be loose when screwing the filter to the engine.