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Looking at my engine bay of my GLB 35, I noticed differences between others of the same make.
Just for my knowledge wondering what this component is used for. (highlighted or outlined in the picture)
Looking at my engine bay of my GLB 35, I noticed differences between others of the same make.
Just for my knowledge wondering what this component is used for. (highlighted or outlined in the picture)
It appears the inital version GLB 35 engine is the first photo. A later updated version (about 2022) is the second photo. The later engine version would be preferred for less risk of engine head failure.
It appears the inital version GLB 35 engine is the first photo. A later updated version (about 2022) is the second photo. The later engine version would be preferred for less risk of engine head failure.
Every comment in this thread so far is incorrect.
First of all both photos are from pre 2022 cars, and the circled part has nothing to do with the cylinder head.
What you see in the picture is an oil feed line to the turbocharger. The first picture is from a European car and the second is from a Malaysian car. Cars made for the Asian markets often use different turbochargers (with the same output) and the oil feed line position differs.
The heatshield is a universal part and you can see the empty hole even on the Asian car.
Every comment in this thread so far is incorrect.
First of all both photos are from pre 2022 cars, and the circled part has nothing to do with the cylinder head.
I don’t think anyone said that the part circled had anything to do with the cylinder heads.
But since the comment about the cylinder heads design changing is also wrong, why are the ‘20, ‘21, ‘22 models failing at a high rate while the ‘23 and later are not? All our ‘21s failed. Our ‘23 is fine. It’s not mileage because the ‘23 has more miles on it than either of the ‘21s had when they failed. The rest are ‘24s and maybe too new to determine.
Is the cylinder head comment not applicable to the GLB35?
Is Mercedes lying when they warranty the cylinder heads through ‘22 model year but not ‘23 and later? This is quite important because we have two test units from different manufacturers in service. One is clearly not better than Mercedes. The opportunity to begin moving the entire fleet to a different brand now has an advantage that will not be available later.
Last edited by Odd Piggy; Oct 23, 2025 at 03:26 PM.
You brough up the cylinder head in a topic that has nothing to do with it.
Not the sensor. GLBs built starting around October 2022 have a new design for the cylinder head.
As for the cylinder head, it has been talked about countless times in other topics. Mercedes revised the part in 2022 and all new cars since have been fitted with the revised part (all cars starting from '23 and some cars from the end of '22).
Cars that had cylinder head issues before '23 obviously were repaired with the old part, so those repairs didn't last and the exhaust valve issue came up again sooner or later.
This applies to all models equipped with the M260 engine (220 / 250 and 35 AMG)
You brough up the cylinder head in a topic that has nothing to do with it.
As for the cylinder head, it has been talked about countless times in other topics. Mercedes revised the part in 2022 and all new cars since have been fitted with the revised part (all cars starting from '23 and some cars from the end of '22).
Cars that had cylinder head issues before '23 obviously were repaired with the old part, so those repairs didn't last and the exhaust valve issue came up again sooner or later.
This applies to all models equipped with the M260 engine (220 / 250 and 35 AMG)
Every comment in this thread so far is incorrect.
First of all both photos are from pre 2022 cars, and the circled part has nothing to do with the cylinder head.
How do you tell both are photos from pre 2022 cars? What changed visually in 2022?
First article is from December 2019
Second article is from January 2021
something tells me both are from before 2022....
By the way nothing changed visually, the revised cylinder heads look identical from the outside.
You brough up the cylinder head in a topic that has nothing to do with it.
I didn’t bring up the cylinder head. It was brought up previously and I was clarifying to another respondent that the sensor (which it turns out is an oil line) was not the reason to prefer a later model.
I don’t know your level of expertise. You may be an engineer at the Untertürheim engine plant for all I know. However, since you insist on being an indefatigable bore, I am through with this thread.
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