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.
E90 oil filter cap leak.
Bmw e90 e92 oil filter housing gasket replacement 2007 2012.
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.
Bmw e90 335i oil filler cap leak.
If it s left unattended it is known to result in catastrophic failure.
Bmw n55 n54 e90 e60 e85 e36 e46 leaking oil filller cap fill seal o ring gasket caked transmission clean filter reverse bimmer bmwcca mustard yellow condensation synthetic inline 6 turbo differential how to diy troubleshooting diagnose engine warranty low miles short distance driving e39 530i 525i 540i 330i.
Both where you add oil and where you drain oil could be.
E36s e46s e90s and f30s all commonly have these leaks.
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.
You will need the oil filter housing profile gasket and housing fasteners.
Valve cover gaskets are cheap and easy to replace.
Oil leaks valve cover gasket oil filter housing gasket.
Seal deteriorating and oil leaking onto manifold.
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.
Bmw 3 series e90 e92 forum bmw e90 e92 e93 3 series general forums general e90 sedan e91 wagon e92 coupe e93 cabrio oil filter cap o ring seal leak page 1 of 2 1.
A leaking oil filter housing is a very common problem with bmw n52 engine.
Rather than costly repairs use this guide to save yourself immeasurable amounts of headache and money.