Anyone know what this leaking part is?

trickster123 · 03-27-2024, 02:50 AM

I was doing an oil change and whilst i was underneath i noticed all this oil but not sure where its came from and what part that even is. E92 325i n52n

Phil325i · 03-27-2024, 11:05 AM

I'd guess at crankshaft main rear seal. The oil is leaking from the mating surfaces between the engine and gearbox, plus maybe the sump gasket, though that could be blow-back...

crashoverride · 03-29-2024, 06:33 PM

Many guesses can be made. However unless you are physically looking at the car it makes the guessing game extra challenging. The best advice for leaks is to take your car down to the local spray and pray car wash throw a can or two of engine cleaner under the ol bonnet and clean things up.

Oil and other liquids have a nasty habit of starting at one spot and ending up at a completely unrelated other spot. It also gives you the ability to see is this a big leak or so slow that the years of build up fool you into thinking it's worse than it actually is.

03-27-2024, 02:50 AM	#1
trickster123 New Member 0 Rep 16 Posts Drives: 2007 e92 325i 2.5L Join Date: Feb 2024 Location: UK iTrader: (0)	Anyone know what this leaking part is? I was doing an oil change and whilst i was underneath i noticed all this oil but not sure where its came from and what part that even is. E92 325i n52n Attached Images
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03-27-2024, 11:05 AM	#2
Phil325i Brigadier General 616 Rep 3,194 Posts Drives: E92 325i MSport Coupe Join Date: Apr 2012 Location: UK South East iTrader: (1) Garage List 2009 BMW 325i Coupe [6.00]	I'd guess at crankshaft main rear seal. The oil is leaking from the mating surfaces between the engine and gearbox, plus maybe the sump gasket, though that could be blow-back... __________________ E92 pre-LCI 325i - Ohlins R&T; H&R spacers; M3 strut brace; Swift thrust sheets; 3 x chassis braces; diff brace; N53 V-brace; 034 subframe inserts; BMS clutch stop; BMS CDV; RE g/box mounts; Delrin shift bushes; Saikoumichi OCC; Cyba scoops; BMW Perf Exhaust; HEL s/steel brake hoses; M3 rear spoiler; Recaro Sportster CSs; M3 white dash LEDs; LED Angels; LED side repeaters; BMW Perf black grille; CSL reps; SSDD carbon diffuser; Monster Wrap black roof/clear front Last edited by Phil325i; 03-27-2024 at 02:38 PM..
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03-29-2024, 06:33 PM	#3
crashoverride Lieutenant 178 Rep 582 Posts Drives: na Join Date: Jul 2006 Location: na iTrader: (0)	Many guesses can be made. However unless you are physically looking at the car it makes the guessing game extra challenging. The best advice for leaks is to take your car down to the local spray and pray car wash throw a can or two of engine cleaner under the ol bonnet and clean things up. Oil and other liquids have a nasty habit of starting at one spot and ending up at a completely unrelated other spot. It also gives you the ability to see is this a big leak or so slow that the years of build up fool you into thinking it's worse than it actually is.
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