I have oil residue on ALL my spark plug threads, M272 2008 C350 / 85kmi, but decent cylinder compression (DRY/COLD: 165-179PSI + WET/COLD: 197-210PSI). Replaced a bad coil, about to do the infamous M272 intake manifold replacement. No clear other evidence of valve cover leaks, but would it be correct to conclude that the only way for oil to get onto (all) the plug threads, is if the sealant on the valve covers around the spark plug wells has given up the ghost due to heat cycling? Concern: 10 minute working time on that recommended sealant seems optimistic to achieve application, cover placement, plus torque of sufficient # of bolts quickly enough to ensure a good, reliable seal. I have everything removed for the I.M. replacement - grudgingly having to face the reality that now is the time to re-seal valve covers, if they need it. Ugh.
I am not sure what the repair will cost in your area. Call a few shops and ask for a quote. It is also a good idea to have them confirm what the issue is.
כל הכבוד להסבר רהוט ומדויק, פעלתי בדיוק שמופיע בסרטון וכעת אין דליפה של שמן. תודה. אגב , מוסך מרצדס לא רשמי ביקשו ממני 900 שקלים, מטבע ישראלי. (253 $)
:)
thank you it helped a lot
Thanks for the feedback. Glad we could help.
I have oil residue on ALL my spark plug threads, M272 2008 C350 / 85kmi, but decent cylinder compression (DRY/COLD: 165-179PSI + WET/COLD: 197-210PSI). Replaced a bad coil, about to do the infamous M272 intake manifold replacement. No clear other evidence of valve cover leaks, but would it be correct to conclude that the only way for oil to get onto (all) the plug threads, is if the sealant on the valve covers around the spark plug wells has given up the ghost due to heat cycling? Concern: 10 minute working time on that recommended sealant seems optimistic to achieve application, cover placement, plus torque of sufficient # of bolts quickly enough to ensure a good, reliable seal. I have everything removed for the I.M. replacement - grudgingly having to face the reality that now is the time to re-seal valve covers, if they need it. Ugh.
You could have leaking valve stem seals or rings. A leak down test would confirm rings are good. Leaving stem seals as culprit.
If i had a valve cover fail on me can i just replace the cover? Its on the exact same vehicle as in the video
You'll want to replace the cover and gasket.
How much does this repair cost a owner
I am not sure what the repair will cost in your area. Call a few shops and ask for a quote. It is also a good idea to have them confirm what the issue is.
Thanx, you helped me now it’s time to shit or get off the pot 💪
Thanks for the feedback. Glad it was helpful!