M-Class (W166) Produced 2012-2015

slow crank after repairing gasket oil leak

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Old Feb 3, 2023 | 02:11 PM
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ML 350 2013 w166 bluetec
slow crank after repairing gasket oil leak

hello, i have ml350 w166 bluetec 08/2013 with 80000 miles on it. The car was leaking oil and i send it to a mechanic and they told me its gasket oil leak that is leaking from the top V engine and he said its known issue with these cars, anyway i leave it there for about 1 week and today when i took the cars and turn it on it was like slow cranking which i am sure it did not do this before drove it all day turned off the car start it again its still slow cranking. Any idea what it may be? Thanks,, see video more detail:
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Old Feb 3, 2023 | 10:26 PM
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From: In the Shadow of the Tetons
2013 ML350 Bluetec
How old is your battery?
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Old Feb 4, 2023 | 04:33 AM
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ML 350 2013 w166 bluetec
Originally Posted by rapidoxidation
How old is your battery?
the battery is 3 months old, i did not have this issue before but it happened after fixing the leak oil from gasket
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Old Feb 4, 2023 | 08:47 AM
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Originally Posted by edii
hello, i have ml350 w166 bluetec 08/2013 with 80000 miles on it. The car was leaking oil and i send it to a mechanic and they told me its gasket oil leak that is leaking from the top V engine and he said its known issue with these cars, anyway i leave it there for about 1 week and today when i took the cars and turn it on it was like slow cranking which i am sure it did not do this before drove it all day turned off the car start it again its still slow cranking. Any idea what it may be? Thanks,, see video more detail:
Oil leak has nothing to do with slow cranking.

Which brand, model and seller details for the battery?
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Old Feb 4, 2023 | 11:40 AM
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ML 350 2013 w166 bluetec
Originally Posted by chassis
Oil leak has nothing to do with slow cranking.

Which brand, model and seller details for the battery?
now the engine light came up, is because they fixed the oil leaking and did not install something correctly maybe fuel has air, but i will send it again and find out
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Old Feb 4, 2023 | 11:59 AM
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From: In the Shadow of the Tetons
2013 ML350 Bluetec
To riff on Chassis' post, air in fuel has nothing to do with slow cranking.
Unless of course you're having to crank for a LONG time and are draining the battery.
I'd start (still) with checking the battery's standing voltage and then check the cranking voltage.
And find out why your engine light is on (obviously).

BTW, I just listened to the video and that cranking speed doesn't seem bad but of course I don't know what it sounds like historically. Are you saying the engine turns over slower than you expect or it takes longer to fire up than it used to?

Last edited by rapidoxidation; Feb 4, 2023 at 12:02 PM.
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Old Feb 4, 2023 | 12:13 PM
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ML 350 2013 w166 bluetec
It takes longer to fire up, before doing the oil leak repair it was good it started right away but now it takes longer about 3 seconds
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