M-Class (W166) Produced 2012-2015

Cold start noise normal?

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Old Jul 1, 2023 | 03:06 PM
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ML400 - 128i - Atlas VR6
Cold start noise normal?

Hey guys, just looking for confirmation if the first few seconds of noise on a cold start is normal.

https://youtu.be/lwgVLBwnxS8

edit: 77k miles, oil changed every 5-6k miles with receipts proof from previous owner. I have owned since 52k.

Last edited by Gray_Panther; Jul 1, 2023 at 09:39 PM.
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Old Jul 1, 2023 | 07:18 PM
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2008 E350, 2012 ML350, 2014 E350, 2015 ML350
Would you mind posting vehicle's VIN number?
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Old Jul 1, 2023 | 09:38 PM
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ML400 - 128i - Atlas VR6
Originally Posted by juanmor40
Would you mind posting vehicle's VIN number?
It falls within the recall for the check valve and the upper timing chain tensioner.

Engine code is 276955 30 302978

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Old Jul 1, 2023 | 09:52 PM
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It does not sound great, but it is best to compare to the sound 5 min later. If the sound goes away after a 30+ seconds and later sound similar to when it is warm, I would try using 5W40 instead. If the sound improves I would look to get the TSB done.

You do not want that to make further damage which includes first adjusters, then camshafts. @$1000 each per train valve x 2 banks
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Old Jul 1, 2023 | 10:29 PM
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ML400 - 128i - Atlas VR6
Originally Posted by juanmor40
It does not sound great, but it is best to compare to the sound 5 min later. If the sound goes away after a 30+ seconds and later sound similar to when it is warm, I would try using 5W40 instead. If the sound improves I would look to get the TSB done.

You do not want that to make further damage which includes first adjusters, then camshafts. @$1000 each per train valve x 2 banks
Thank you. Tomorrow morning I will start the engine and let it idle for a bit, and then recycle a couple times with about 1 min intervals and note the sounds or any differences and report back.

I have been using LiquiMoly 5W-40 predator blood since purchasing the vehicle at 52k. Thank you for the input, Juan!
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