S-Class (W221) 2007-2013: S 320 CDI, S 350, S 450, S 500, S 550, S 420 CDI, S 600

Light tap on a gas pedal creates hight RPMs and slow return to idle gear lever in N p

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Old Jan 9, 2025 | 05:00 AM
  #26  
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if it leaked that bad you lose oil - pistons going up and down tend to pump air out not suck it in - investigate the rest of the engine breather - many like to fit a new separator at the back of the engine as the miles increase
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Old Jan 9, 2025 | 05:14 AM
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Originally Posted by BOTUS
if it leaked that bad you lose oil - pistons going up and down tend to pump air out not suck it in - investigate the rest of the engine breather - many like to fit a new separator at the back of the engine as the miles increase
The separator is new, i have changed that part a few months ago, only the outside part because of the oil leaking, the other round part looks like new







Last edited by ANEV; Jan 9, 2025 at 08:22 AM.
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Old Jan 9, 2025 | 05:18 AM
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Btw the car is loosing about 1l of oil for 4k km
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Old Jan 9, 2025 | 08:34 AM
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on the floor or burning out the exhaust - big difference

if its that out the exhaust - that's not too much if high miles - electroplated bores are a sick joke - and Merc make some of the most useless fragile coatings used by any brand
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Old Jan 9, 2025 | 09:08 AM
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Originally Posted by BOTUS
on the floor or burning out the exhaust - big difference

if its that out the exhaust - that's not too much if high miles - electroplated bores are a sick joke - and Merc make some of the most useless fragile coatings used by any brand
"on the floor or burning out the exhaust"- very good question! I cant detect any smell of burning oil from the exhaust, in other hand the floor of the car is not the cleanest, i already changed the oil cooler gasket and oil filter gasket(2 times) but it looks like i need to repair it again(its leaking again-Elring gasket are not the best i guess). It looks like the crankshat seal is leaking too, the area around is oily, maybe its because of leaking oil cooler and filter gasket... i alredy ordered crankshaft front seal, will change it and update... 201000km on odo, but 15 year old 😀

Last edited by ANEV; Jan 9, 2025 at 09:26 AM.
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Old Jan 9, 2025 | 12:31 PM
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that little oil used you likely won't see or smell it being burnt - but its is more than ideal, and again points toward worn electroplated bores that will make the car breath more heavily and it pushes stuff past gaskets and seal...

do a compression test - I believe you can get Xentry to do a pretend one - but of course that’s nothing like a real one
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Old Jan 9, 2025 | 12:52 PM
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Originally Posted by BOTUS
that little oil used you likely won't see or smell it being burnt - but its is more than ideal, and again points toward worn electroplated bores that will make the car breath more heavily and it pushes stuff past gaskets and seal...

do a compression test - I believe you can get Xentry to do a pretend one - but of course that’s nothing like a real one
Its already done, real one. The shop says its perfect-12,5bar all 8 cylinders. I tryed the Xentry one but...i dont have additional source of electricity and seems to me that its not 100% real if done only with cars battery. I have done it one time, here it is the graph


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Old Jan 9, 2025 | 12:58 PM
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is the Xentry fake one not done with the engine running ?

that has a some discrepancy

if you were leaking 1tr externally you would see it clearly

what mileage ?
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Old Jan 9, 2025 | 12:59 PM
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FYI if I had the choice to pull one of these apart or say the compression was OK... what do you think my answer would be
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Old Jan 9, 2025 | 01:06 PM
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Originally Posted by BOTUS
FYI if I had the choice to pull one of these apart or say the compression was OK... what do you think my answer would be
I was not there...he take the money...maybe its not bad idea to make the test with my hands...tired of making all kind of stuff...
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Old Jan 9, 2025 | 01:12 PM
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Originally Posted by BOTUS
is the Xentry fake one not done with the engine running ?

that has a some discrepancy

if you were leaking 1tr externally you would see it clearly

what mileage ?
The Xentry one is done with ignition on, brake and gas pedals fully depressed, and running the ignition(trying to start the car) for about 6-10 seconds. Odometer is at 201000km
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