Oil found on tensioner and pulley - Spot on driveway
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Junior Member
Joined: Mar 2020
Posts: 43
Likes: 8
From: Houston Metro
16 Acura RDX 128k mi 2013 MB E550 4M 124mi
Oil found on tensioner and pulley - Spot on driveway
In April I had my indy put on a serpentine belt and thanks to MBWorld I saw a comment that said I should have replaced my tensioner and pulley(s). Yesterday my indy replaced them along with a coolant temp sensor (wrong part). There was oil on the tensioner and pulley. This morning there was a spot on my driveway, Since I purchased my MB (March 2020) I have never noticed spots on my driveway under my Benz. Looking for advice about what to do. 2013 MB E550 4M 76,848 miles. Still trying to figure out the right resolution to use when posting so please bear with me.
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Joined: Jun 2020
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'11 E350, '11 E550, '98 M3, '95 E320
The spot on the driveway looks like blue dried coolant to me... not oil. MB and BMW use/have used blue HOAT coolant. Is the coolant in the reservoir that deep blue color?
Thread Starter
Junior Member
Joined: Mar 2020
Posts: 43
Likes: 8
From: Houston Metro
16 Acura RDX 128k mi 2013 MB E550 4M 124mi
I found this on the internet:
-
- Engine oil cooler sealswill leak with age. The telltale sign of a coolant seal leak is a dirty belt tensioner, as oil seepage from the cooler mists onto the tensioner and the oil attracts dirt.Depending on which model car you drive, replacing the oil cooler seal on V6 applications, it might require removal of the power steering reservoir.
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Joined: May 2019
Posts: 34
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From: HTX
2012 E550 4matic Sedan; 2005 Volvo XC70
Great to know! I'll keep an eye out on my M278.
Who is your mechanic in Houston, if you don't mind sharing? I'm a native Houstonian and know folks in HOU with MBs.
Who is your mechanic in Houston, if you don't mind sharing? I'm a native Houstonian and know folks in HOU with MBs.
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