08 SI oil leak help?

2008si · 12-01-2019, 03:58 PM

Totally new to this car. I googled this leak I have. In this pic I oil sitting below the black round cap (Oil filter cap?) on top of the oil cooler. Below that you see the leak is hitting the rad hose going in under that area. The front of the motor is oil free/very clean. The belt is in great shape, no squeals from an oil drip if active. Is there a seal at cooler to housing it is on? Is that black cap leaking?
I don't have a bad leak, everything is just kinda sweaty covered in oil.

Steeler · 12-01-2019, 04:07 PM

The oil filter cap has an o ring that should be replaced every time you change the filter( the filters typically come with a new o ring for the cap and a crush washer for the drain plug )
If that o ring is not seated properly or the torque on the cap is not to spec you will get pressurized oil leaking. Look at both those things I would say.

Our03z4 · 12-01-2019, 04:43 PM

Have that same leak on mine so I'm subbing.

vt100 · 12-01-2019, 11:35 PM

Quote:

Originally Posted by dbarton62

The oil filter cap has an o ring that should be replaced every time you change the filter( the filters typically come with a new o ring for the cap and a crush washer for the drain plug )
If that o ring is not seated properly or the torque on the cap is not to spec you will get pressurized oil leaking. Look at both those things I would say.

This!

Then keep monitoring the area around. Next (in order of complexity) suspect would be the oil filter housing gasket. If still leaking - check the valve cover gasket. But oil will be everywhere around if the valve cover is leaking.

vapormike · 12-26-2019, 02:09 PM

Ditto on checking the O ring. But this looks like a classic case of oil filter housing gasket. You can see there seems to be a lot of oil gathered just right beneath the housing.

WickedNy · 12-28-2019, 07:05 PM

Depending on your mileage might be due for vcg, oil gasket, etc...I'd say year wise your in the ballpark for it.

12-01-2019, 03:58 PM	#1
2008si Enlisted Member 5 Rep 34 Posts Drives: 2008 Z4 Join Date: Nov 2019 Location: SW OHIO iTrader: (0)	08 SI oil leak help? Totally new to this car. I googled this leak I have. In this pic I oil sitting below the black round cap (Oil filter cap?) on top of the oil cooler. Below that you see the leak is hitting the rad hose going in under that area. The front of the motor is oil free/very clean. The belt is in great shape, no squeals from an oil drip if active. Is there a seal at cooler to housing it is on? Is that black cap leaking? I don't have a bad leak, everything is just kinda sweaty covered in oil. Attached Images
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12-01-2019, 04:07 PM	#2
Steeler Colonel 2428 Rep 2,702 Posts Drives: Built not Bought 04 Z4 VF Join Date: Feb 2013 Location: Kitchener Ontario Canada iTrader: (2)	The oil filter cap has an o ring that should be replaced every time you change the filter( the filters typically come with a new o ring for the cap and a crush washer for the drain plug ) If that o ring is not seated properly or the torque on the cap is not to spec you will get pressurized oil leaking. Look at both those things I would say. __________________ W2A Intercooled Vortech V3Si, custom ducting, Alpha N, 60# Bosch,2.62 pulley, multi port WMI, Severn Tuning(pokeybritches), Tial, magnaflow,SS race muffler, 42 design,3.91LSD, H&R, Hotchkis,ST coils,Konis, Megan camber arms, AKG SS, Nylon mounts, Poly bushings, Carbon interior, CF Aero.APEX
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12-01-2019, 04:43 PM	#3
Our03z4 Captain 1682 Rep 684 Posts Drives: 2008 BMW Z4 3.0si Coupe, Join Date: Nov 2016 Location: USA iTrader: (0)	Have that same leak on mine so I'm subbing.
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12-26-2019, 02:09 PM	#5
vapormike New Member 0 Rep 5 Posts Drives: Z4 Coupe 3.0si Join Date: Aug 2014 Location: Bellevue, WA iTrader: (0)	Ditto on checking the O ring. But this looks like a classic case of oil filter housing gasket. You can see there seems to be a lot of oil gathered just right beneath the housing.
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12-28-2019, 07:05 PM	#6
WickedNy Get Some 225 Rep 759 Posts Drives: 07 Z4 3.0si Join Date: Jan 2012 Location: Long Island iTrader: (1) Garage List 07 z4 3.0si [0.00]	Depending on your mileage might be due for vcg, oil gasket, etc...I'd say year wise your in the ballpark for it.
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