What is the engine oil capacity for a 2005 Mercedes Benz E 320 CDI?

Question edited for a lot more clarity.
Question moved to model category.

These things have fuses boxes all over the place and are a nightmare to work on :>D

Fuse Box Diagram Mercedes-Benz M-Class (W164; 2006 ...

https://fuse-box.info > mercedes-benz > mercedes-benz-...

Here you will find fuse box diagrams of Mercedes-Benz ML280, ML300, ML320, ML350, ML420, ML450, ML500, ML550, ML63 2006, 2007, 2008, 2009, 2010 and 2011, ...

Fuses W164 M-Class 2006-2011 Diagram, Box Location ...

https://www.mercedesmedic.com > fuse-box-location-d...

Fuse locations on Mercedes-Benz M-Class W164 2006-2011. Main fuse box and relay box is located in the engine compartment. Rear, passenger side in the trunk.
Model: ML 320 CDI ML 320 BLUETEC ML 350 ...
Years: 2006 2007 2008 2009 2010 2011
Chassis: 164
Make: Mercedes-Benz

Fuses W164 M-Class 2006-2011 Diagram, Box Location ...

https://mbworld.org > attachments > m-class-w164
PDF
Fuse locations on Mercedes-Benz M-Class W164 2006-2011. Main fuse box and relay box is located in the engine compartment. Rear, passenger side in the trunk.
9 pages

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Trans.: Mercedes Auto Trans Fluid 5L (ATF1 LV) - Pentosin 1088206 https://bevo.mercedes-benz.com/bevolisten/229.5_en.html

For use in vehicles/engines refer to Sheet 223.2. ... Mercedes-Benz Genuine Engine Oil MB 229.5, x, Daimler AG, Stuttgart/Deutschland. Mercedes-Benz ..

code p0400 refers to exhaust gas recirculation(EGR) system---flow malfunction.===causes---hose leak/blockage--basic setting not carried out (if applicable)---wiring---EGR valve ---EGR solenoid---ECM
check out the valve and solenoid.

mobil one 0w40 is what is recommended

For 2002 Mercedes-Benz C 220 CDI WDB203, engine code 611.962, the engine oil capacity is 6,5 liters, with oil filter replacement.

If the engine amber light comes on , it generally means the engine needs servicing! Or you have a faulthy sensor.
Oil/ filter change first.

It's a black cap at the rear of the motor. (drivers side) on top.It's a paper type filter.

the 320 and 430 models of that year held 8.5 quarts or 8 liters with filter replacement

computerized oil indicator is only way if no dipstick. turn key halfway on... toggle through steering wheel buttons until check oil function. computer only checks if engine is off for a few minutes. this is for a 2005 cdi e320, might work for you.

it's time to go to the shop.
oil service
cabin filter
air filter
probably tire rotation
tune up either check up or perform.
do not go to a cheap place it will cost you lots more.
inspection of suspension, fluids, lubrication.
probably brake fluid flush.
probably coolant flush
possibly tranny service