M276 engine startup noise - Check valves already installed
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S350
M276 engine startup noise - Check valves already installed
I have a 2013 S350 (M276 gasoline engine) that started producing slight engine noise at startup a few months ago. The noise level has increased recently. Also, a message appeared saying I should top off the engine oil which took 1L of additional oil to top it off.
I'm aware of bulletin LI05.10-P-056435 that addresses this issue by installing check valves and chain tensioners. However, the tech at the dealership says my engine has the check valves installed already and he thinks that the driver's side intake camshaft adjuster went bad and he thinks I should change both adjusters and tensioners on the driver's side to solve the issue. I asked him if he thinks the check valve is also bad, and he said it's unlikely.
He tried to push me to change all four adjusters on both sides but at $1k a piece I don't see why I should pay for something that is not broken. What do you guys think?
I'm aware of bulletin LI05.10-P-056435 that addresses this issue by installing check valves and chain tensioners. However, the tech at the dealership says my engine has the check valves installed already and he thinks that the driver's side intake camshaft adjuster went bad and he thinks I should change both adjusters and tensioners on the driver's side to solve the issue. I asked him if he thinks the check valve is also bad, and he said it's unlikely.
He tried to push me to change all four adjusters on both sides but at $1k a piece I don't see why I should pay for something that is not broken. What do you guys think?
Out Of Control!!
Joined: Sep 2018
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From: unbegrenzt
2017 GLE350 4MATIC
I have a 2013 S350 (M276 gasoline engine) that started producing slight engine noise at startup a few months ago. The noise level has increased recently. Also, a message appeared saying I should top off the engine oil which took 1L of additional oil to top it off.
I'm aware of bulletin LI05.10-P-056435 that addresses this issue by installing check valves and chain tensioners. However, the tech at the dealership says my engine has the check valves installed already and he thinks that the driver's side intake camshaft adjuster went bad and he thinks I should change both adjusters and tensioners on the driver's side to solve the issue. I asked him if he thinks the check valve is also bad, and he said it's unlikely.
He tried to push me to change all four adjusters on both sides but at $1k a piece I don't see why I should pay for something that is not broken. What do you guys think?
I'm aware of bulletin LI05.10-P-056435 that addresses this issue by installing check valves and chain tensioners. However, the tech at the dealership says my engine has the check valves installed already and he thinks that the driver's side intake camshaft adjuster went bad and he thinks I should change both adjusters and tensioners on the driver's side to solve the issue. I asked him if he thinks the check valve is also bad, and he said it's unlikely.
He tried to push me to change all four adjusters on both sides but at $1k a piece I don't see why I should pay for something that is not broken. What do you guys think?
Changing one side at a time seems reasonable, if you agree with the shop’s diagnosis.
I have a 2013 S350 (M276 gasoline engine) that started producing slight engine noise at startup a few months ago. The noise level has increased recently. Also, a message appeared saying I should top off the engine oil which took 1L of additional oil to top it off.
I'm aware of bulletin LI05.10-P-056435 that addresses this issue by installing check valves and chain tensioners. However, the tech at the dealership says my engine has the check valves installed already and he thinks that the driver's side intake camshaft adjuster went bad and he thinks I should change both adjusters and tensioners on the driver's side to solve the issue. I asked him if he thinks the check valve is also bad, and he said it's unlikely.
He tried to push me to change all four adjusters on both sides but at $1k a piece I don't see why I should pay for something that is not broken. What do you guys think?
I'm aware of bulletin LI05.10-P-056435 that addresses this issue by installing check valves and chain tensioners. However, the tech at the dealership says my engine has the check valves installed already and he thinks that the driver's side intake camshaft adjuster went bad and he thinks I should change both adjusters and tensioners on the driver's side to solve the issue. I asked him if he thinks the check valve is also bad, and he said it's unlikely.
He tried to push me to change all four adjusters on both sides but at $1k a piece I don't see why I should pay for something that is not broken. What do you guys think?
