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Is this sound normal when starting the car?

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Old Apr 26, 2025 | 10:04 AM
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Is this sound normal when starting the car?

Hello guys so about a month or two ago I bought a c230 2008 m272 v6 as my first car but i noticed sometimes when i start the car this sound. I’ve been told that its normal because it takes time for oil to build up but is it really that or it is a problem?
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Old Apr 27, 2025 | 03:27 PM
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Originally Posted by natov8888
Hello guys so about a month or two ago I bought a c230 2008 m272 v6 as my first car but i noticed sometimes when i start the car this sound. I’ve been told that its normal because it takes time for oil to build up but is it really that or it is a problem?
It sounds like “rod knock” until the oil pressure builds up, as you were told. It may not be serious because it only last a few seconds, but it’s not normal for M272 engines. Is that on a cold start or a hot start? What oil viscosity are you using? The potential remedy depends on when it is happening.
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Old Apr 29, 2025 | 12:58 AM
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I’ve had that very sound on a warm (not cold, not hot) start since the car was new. Now 253k on the clock. I just call it character. Levity aside, my guess is partially collapsed lifters.
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Old Apr 29, 2025 | 12:33 PM
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Originally Posted by cvx5832
I’ve had that very sound on a warm (not cold, not hot) start since the car was new. Now 253k on the clock. I just call it character. Levity aside, my guess is partially collapsed lifters.
@natov8888 Maybe it’s more normal than I was aware of. And you have it from a person who meticulously maintains his vehicles that it’s not a problem.
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Old May 1, 2025 | 09:51 AM
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This vehicle is now on daily commute duty. So if it fails on me, I'll be sure to post that here.

I tried getting the dealer to recognize it, even kept it overnight but was returned to me as "cannot reproduce customer concern".
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