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GL Class (X166) 2013-2015 after facelift became GLS (X166)

Oil Pressure

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Old Mar 19, 2023 | 09:11 PM
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2014 GL550; 2010 GL450
Oil Pressure
I'd like to measure oil pressure on my 14 GL550. On most engines, you'd remove the oil pressure sender and attach a gauge but on the M278 I can't find reference to oil sender unit. I haven't found oil pressure parameter in Xentry either. Does anyone know how to measure oil pressure on this engine?
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Old Mar 20, 2023 | 02:28 AM
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2014 GL450, 1992 W140 300SD, 1993 W140 300SE, 1987 E30 Convertible
There is a port on oil filter housing front
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Old Mar 20, 2023 | 12:16 PM
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2014 GL550; 2010 GL450
Originally Posted by arsupisemnet
There is a port on oil filter housing front
I don't see a port on the oil filter housing. Could you point to it in this picture if possible? Thanks.

M278
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Old Mar 20, 2023 | 12:32 PM
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2014 GL450, 1992 W140 300SD, 1993 W140 300SE, 1987 E30 Convertible
The plug with hex socket to the left of the tensioner roller. Anyway what is the need for oil pressure?
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Old Mar 20, 2023 | 05:19 PM
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2014 GL550; 2010 GL450
Originally Posted by arsupisemnet
The plug with hex socket to the left of the tensioner roller. Anyway what is the need for oil pressure?
Got it. I never would have guessed it. Thanks a million!
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