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Discussion Starter #1 (Edited)
Hi everyone,

I am about to help a friend replace the oil pan gasket on their 328i (6MT). Parts are about to be ordered, and I just wanted to confirm new aluminum/torque to yield bolts that would be required when removing the subframe.

6x Subframe bolts
6x "Rod" bolts (rod where the front jack point is)
2x Steering Rack bolts
2x Steering Rack nuts
Oil pan bolt set

Are there any other common aluminum/torque to yield bolts when doing this job that I am forgetting?

I've copied the realoem links that I used for reference.

http://www.realoem.com/bmw/enUS/showparts?id=PH73-USA-01-2011-E90N-BMW-328i&diagId=31_0715

http://www.realoem.com/bmw/enUS/showparts?id=PH73-USA-01-2011-E90N-BMW-328i&diagId=32_1509

Thanks!
 

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...I am about to help a friend replace the oil pan gasket on their 328i (6MT). Parts are about to be ordered, and I just wanted to confirm new aluminum bolts that would be required when removing the subframe...
I have NOT done the job, but that would be news to me if any of the bolts OTHER than the pan bolts are single use aluminum.

Aluminum bolts (which are SINGLE USE) are used in ANY situation where the fastener touches MAGNESIUM ALLOY as is used in the crankcase, hence aluminum oil pan & aluminum bolts threaded into the Magnesium Alloy crankcase. ALL the pan bolts need to be replaced.

However, I would be very surprised to find that any of the other fasteners you reference are anything but Steel, and as such, there is NO reason they cannot be reused. Here is a link to the TIS procedure for oil pan/sump gasket replacement. Note "Necessary Preliminary Tasks" listed in the procedure, and click on those hyperlinks to see steps in each of those. If bolts are aluminum and are to be replaced, the procedure will so state:
https://www.newtis.info/tisv2/a/en/e90-328i-lim/repair-manuals/11-engine/11-13-oil-sump/GUrIoa7

If you really want to be extra pro-active, use a magnet on all bolts to be removed, and if any are NOT magnetic, then either someone ahead of you used the wrong fastener, or you need to get a new (correct ;-) one.

Here is a vendor page showing necessary parts to do the job (make sure year is correct). If bolts other than pan bolts (which DEFINITELY DO NEED REPLACING) were single use aluminum, I would think the vendors would try to sell you those. :)
https://www.autohausaz.com/catalog/k/bmw/2008/1441662-328i_e909192/oil pan gasket

Please let us know what you find,
George
 

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Discussion Starter #4 (Edited)
I have NOT done the job, but that would be news to me if any of the bolts OTHER than the pan bolts are single use aluminum.

Aluminum bolts (which are SINGLE USE) are used in ANY situation where the fastener touches MAGNESIUM ALLOY as is used in the crankcase, hence aluminum oil pan & aluminum bolts threaded into the Magnesium Alloy crankcase. ALL the pan bolts need to be replaced.

However, I would be very surprised to find that any of the other fasteners you reference are anything but Steel, and as such, there is NO reason they cannot be reused. Here is a link to the TIS procedure for oil pan/sump gasket replacement. Note "Necessary Preliminary Tasks" listed in the procedure, and click on those hyperlinks to see steps in each of those. If bolts are aluminum and are to be replaced, the procedure will so state:
https://www.newtis.info/tisv2/a/en/e90-328i-lim/repair-manuals/11-engine/11-13-oil-sump/GUrIoa7

If you really want to be extra pro-active, use a magnet on all bolts to be removed, and if any are NOT magnetic, then either someone ahead of you used the wrong fastener, or you need to get a new (correct ;-) one.

Here is a vendor page showing necessary parts to do the job (make sure year is correct). If bolts other than pan bolts (which DEFINITELY DO NEED REPLACING) were single use aluminum, I would think the vendors would try to sell you those. :)
https://www.autohausaz.com/catalog/k/bmw/2008/1441662-328i_e909192/oil pan gasket

Please let us know what you find,
George
Thanks for your input!

Doing some more research, it looks the reinforcement rod (front jack point on these cars) is attached using torque to yield bolts. Same with the bolts attaching the steering rack to the front subframe. Because of that, I think replacement would be wise.

On sedans, it seems like the M12 bolts used for the subframe do not have an additional angle requirement, so reuse should be ok. Coupes and convertibles may have M10 bolts that do require an additional angle.
 
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