GL Class (X164) 2007-2012: GL320CDI, GL420CDI, GL450, GL550

X164 pass oil leak hitting exhaust manifold

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Old Jan 10, 2026 | 01:38 PM
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X164 pass oil leak hitting exhaust manifold

Hi. Have 2010 GL 450 with 140K miles. Well maintained as I owed it for 12 years. I smell burnt oil on passenger side and looks like valve cover is leaking. Looking at the photos can you confirm?

I bought the sealer and will change PVC valve and 3 caps when in there.

Also as thermostat just froze open (and received a code) I plan to do that, oil cooler gasket and p/s reservoir gasket (URO). Should I do water pump while in there. Spins fine, looks good.

Thank you for you help as always. I did visit the MB museum in Germany - best museum I ever attending. Also saw the S class built 1 hr south - was amazing tour.

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Old Jan 12, 2026 | 12:44 PM
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GL450
I also have a 2010 GL450 with 140k miles, and it's starting to seep oil but not as bad as yours so I'm very interested in your repair. Oil spreads everywhere and it's hard to track the source, can you clean off that section and see where the oil is coming from?
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