How To Change Engine Oil And Filter On 2010 Mb S550 Formatic

Mercedes

02/24/21
3 Min Read
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How to Fix Common Mercedes-Benz Oil Leaks (M112, M113, M272, M273)

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Do y'all enjoy oil stains in your driveway and constantly having to cascade more oil into your engine every calendar month? We didn't think so. Here are a few of the mutual causes of oil leaks on modern Mercedes-Benz engines and how to service them.

Not all oil leaks are created equal. Some leaks plague certain engines more others, so it'southward important to diagnose where your engine is leaking from before yous dive into replacing every gasket and seal y'all tin get your gloves on. One pro-tip is to clean off any surface you suspect is leaking oil using a brake cleaner and a rag. After the surface is clean, drive the car for a few hundred miles and cheque dorsum on the surface area. If you notice fresh oil where two surfaces run across or oil "spraying" from another area, yous know where the leak is and which seals/gaskets to replace.

Most Mutual Mercedes-Benz Oil Leak Locations

Oil Separator
Camshaft plugs - 30mm and 65mm
Valve cover gaskets
Oil filter housing and libation gaskets
Timing comprehend plug

Mercedes-Benz Engine Codes

To identify which engines are susceptible to certain oil leaks, refer to this list:

M112 - V6 that ranged from 1997-2005, used in C-Class, CLK , Due east-Class, SLK, Chrysler Crossfire
M113 - V8 used from 1997-2005, used in Due east-Class, ML, Southward-Form, G-Wagen, CLS
M272 - V6 used from 2004-2011, C-Class, E-Class, SLK, CLK, R-Class, Sprinter, GLK
M273 - V8 used from 2006-2014, E-Form, SL, Southward-Class, CLS, Thou-Wagen, ML, GL, R-Grade

FCP Euro Mercedes-Benz C300 Endurance Race Car AER

Mercedes-Benz Oil Leak Locations - M112, M113, M272, & M273 Engines

Mercedes-Benz Engine Oil Leaks - Rear

The most likely rear engine leaks include the oil separator and the cam plugs ( 30mm and 65mm ). The oil separator is held onto the dorsum of depository financial institution 1 (passenger side) with either 4 torx bolts or 4 external torx bolts. Remove the oil separator, supplant, and clean the oil residue from the engine.

Depending on the model, there are usually two 30mm and i 65mm plug located on the back of the engine on both sides. The plugs will pop out with a screw driver and the new ones can exist pushed on by mitt. Exist sure that they're pushed in flush with the engine as improper seating will outcome in, y'all guessed it, an oil leak.

Mercedes-Benz Valve Cover & Spark Plug Wires - Front & Rear

The valve comprehend gasket and valve comprehend bellows tin leak when the gaskets fail due to repeated hot/cold engine cycles.

Remove engine cover, air box and air duct tubing.
Remove ringlet packs T30 bolts and spark plug wires. In that location are 2 spark plugs per cylinder. Label the whorl packs "A" and "B". The best trick for getting the plug wires off without breaking them is to utilise a 17mm wrench.There is a special 17mm wrench with a bend that works great.
Remove breather hoses (they are unremarkably brittle so be prepared to supplant them) from the valve covers.
Remove the E10 Torx bolts and the valve cover.
Replace your spark plugs now if you haven't already, since you have easy access with the valve covers off.
Remove the T25 bolts from the sabbatical covers and pry them off with a screwdriver.
Remove all sealant from the breather comprehend.
Apply new sealant to the channels of the sabbatical cover, place valve comprehend down, and tighten T25 bolts by manus.
Supercede the valve encompass gasket.
Reinstall components. When installing the air box, lubricate the seal with some lube for the mass air period connection. This will brand information technology a lot easier to install .

Mercedes-Benz Engine Oil Leaks - Front

Oil Filter Housing & Gaskets

The driver'south side front of the engine is where you volition find your oil filter and housing. If you come across oil at the bottom of the housing, you may demand a new oil filter housing and libation gaskets. The process of replacing these gasket is super piece of cake:

Drain oil
Remove oil filter
Remove oil cooler
Remove oil filter housing nut with a 46mm socket.
Supersede the gaskets
Reinstall parts, replace oil filter, and oil.
Clean oil remainder

Mercedes-Benz M112 Oil Filter Housing Diagram

Timing Encompass Plug

If your timing comprehend plug is leaking, it'due south likely due to a bad seal. Luckily, replacement could not be easier:

Remove ii torx bolts and allen commodities
Supplant the crush washer, embrace and gasket
Clean oil residue

Mercedes-Benz M112 Timing Cover Plug

We hope this commodity was helpful in helping solve your Mercedes-Benz oil leak woes. Cheque out the link below to go the seals and gaskets used in this article, besides as other parts for your Mercedes-Benz. If y'all have any questions, be sure to exit them in the comments department below.

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Jerry is a Principal BMW technician from Boston, MA with 10 years of automotive experience. He currently owns a BMW X5 3.0i, 540i, and a bass boat. During the calendar week he spends his time in the shop fixing BMWs and likes fresh water fishing on the weekends.