I noticed an oil leak when last changing the oil. However, I cannot really determine where it is coming from. Any thoughts on oil leaks for the M273 (5.5 ltr) towards the front left side of the engine? Thank you.

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2008 S550
2010 GLK350
1997 E420 (retired)
2005 CLK500 (retired)

The oil cooler/oil filter housing is a common leaker. The part is updated so best to replace the whole shebang rather than try to reseal it.

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff

Would you happen to know the replacement part number?

Items 15,50.
I think you should clean the spot and try to locate the faulty component, how many miles are on it?

Attached Thumbnails

   

Charge air pipe o-ring, very common............

Thank you all. Not sure what that air pipe o-ring is but will try to figure it out.

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2008 S550
2010 GLK350
1997 E420 (retired)
2005 CLK500 (retired)