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Hello, I have a large amount of oil streaming from the side of the engine block on my M275. See attached pics. Oil is leaking from area highlighted in red. The 2nd pic is a close up of the same area where you can see the oil dripping. I'm trying to figure out what this pice is called so I can order the correct gasket/seals.
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Thanks for your help!
 

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I can look up part numbers if there is a good resource available. I'm just not sure where to go. The schematics I'm finding don't show everything. Thanks
 

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I'm putting together my shopping list for pulling the subframe to fix the oil leak. Can anyone tell me if the turbo wastegate ever goes bad? Anything else I need to buy that are common failure items? Thanks
 

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The valve cover gaskets are known to leak. Are you sure the source of the drip isn't coming from up higher and it just looks like it is from where you circled? Best bet is to clean everything thoroughly, start the car and watch. Driving the car causes too much air moving which disperses the oil everywhere.
 

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The part that you’ve shown connects to the oil cooler. So, I believe that it is an oil cooler thermostat. It’s damn near impossible to get to, however, unless you lower the subframe and remove the driver/left side engine mount.

I would want to be very, very certain that it’s, in fact, the culprit before undertaking that repair...
 

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The valve cover gaskets are known to leak. Are you sure the source of the drip isn't coming from up higher and it just looks like it is from where you circled? Best bet is to clean everything thoroughly, start the car and watch. Driving the car causes too much air moving which disperses the oil everywhere.
Brand new valve cover gasket. As you mentioned, initially I thought that was the problem too. I've taken a small inspection mirror and used light to determine it's actually leaking from the bottom bolt shown in the close up. It's completely dry above that on the circular piece that is highlighted in the first photo. It's so tight in there that the other 2 bolts that hold that piece on are not shown in the pic. I removed the coil for inspection to make sure it wasn't coming from above.

The part that you’ve shown connects to the oil cooler. So, I believe that it is an oil cooler thermostat. It’s damn near impossible to get to, however, unless you lower the subframe and remove the driver/left side engine mount.

I would want to be very, very certain that it’s, in fact, the culprit before undertaking that repair...
I am certain, as explained in the reply to Triple Cranks. Subframe has to come out anyway to replace the broken motor mount. I want to have everything ready to go so I'm in and out within the same day. At least now I have a name for the part to go with. That is very helpful Thanks!

EPC on my SDS is giving an error message, "no valid startkey was found for the current program." I'm not sure if this is possible to fix or not. I found a free EPC online, but it's not showing the parts I need. It's called BenzCat. Does anyone have any helpful info about how to fix the error or a good free online EPC? Thanks again!!
 

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Hi,

I'd say it needs the Keygens doing (EPC)

HTH,
Thanks Dave. I forgot that I had moved this hard drive from another PC and thus required new keys.

I was able to get EPC working and found out that the entire assembly is called an oil filter housing part number 2751800334. The gasket used between it and the engine block is 1370110180. The 2 O-rings for the oil cooler connection is 0129975648. I cannot find any mention of the seal where the 3 bolts are holding the round cover. I hope it uses standard O-rings.

See pics; It looks like it's the engine oil pressure regulator rather than the thermostat. I'm pulling it out and replacing all the associated gaskets & seals.
 

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OK, so it’s listed as: Oil Filter Housing, even though, clearly, that’s a pressure bypass/regulator spring in there.

How do you plan to get it out?
 

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I’ve got my ABC pump out (replacing it) and the engine mount out (also getting replaced) and I can’t see the mounting bolts for that thing even with a mirror.

Keep us posted...
 
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