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  #1  
Old 10-29-2013, 09:51 PM
tivoliman's Avatar
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Location: New Jersey
Posts: 372
The cause of oil leaks is questioned

Why do some cars leak oil from the rear engine seal, and others don't?

After owning several mercedes, I've realized that they have all had an oil leak. But, along came my current W124 E420 1995 with a mere 147,000 miles and there is no oil leak.

I can actually park on my concrete driveway, without leaving a stain.

Well, my question is simple. How do I keep it from developing a leak?

Special oil? No jack rabbits from red lights (me like the power of 8 cylinders)? Or what?

Thanks for the suggestions. I want to keep this gem clean and dry.

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Bill Fisher

'86 560SL (186K) - Now a 'classic' : Registered as an Historic Vehicle
'95 E420 (198K)
'99 E320 (80K)
'03 LS430 (Lexus)
- - - - -
'95 E420 (231K) Sold to a happy buyer, new to Mercedes
'90 300E (65K) Sold to an Mercedes Lover
'92 190E (215K) - retired to the salvage yard, sigh
'93 500SEL (214K) - Moved to another family, still runs like a young pup
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  #2  
Old 10-30-2013, 06:02 AM
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Replace the seals before they develop leaks
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1990 190E 2.6L
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  #3  
Old 10-30-2013, 09:41 AM
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Location: NE Ohio
Posts: 5,034
Maybe better sealing material? better designs around the seals so that heat exposure is limited?
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Check here for compatibility, diagnostics, and availability!

(4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!)


82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k
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  #4  
Old 10-30-2013, 04:45 PM
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This car was probably serviced by a real Mercedes mechanic and not by DIY. He corrected the crankcase breathing system. This is 50% the problems with the rear engine seal leak. On these older cars don't use synthetic oil before 1998 because these engines where not made for it.
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  #5  
Old 10-30-2013, 05:00 PM
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We picked up a 1988 300E from dealer my father was working at the time. Serviced there since new. That SOB always leaked oil all over the driveway until it was sold that way. Was not going to replace the seal in that car. Never driven with synthetic either.
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  #6  
Old 10-30-2013, 05:28 PM
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Do you think the dealer has real mercedes mechanics? They work all on flat rate, when the car comes in for service they just do what it takes to get it out, and don't check this type of things. They don't have real mercedes mechanics. A real mercedes mechanic has his own shop and trained their mechanics this way. I know it from my repair shop where i bring my cars.
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  #7  
Old 10-30-2013, 07:44 PM
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plrase tell me more

Quote:
Originally Posted by silverteam View Post
This car was probably serviced by a real Mercedes mechanic and not by DIY. He corrected the crankcase breathing system. This is 50% the problems with the rear engine seal leak. On these older cars don't use synthetic oil before 1998 because these engines where not made for it.
I'm thinking a breathing system would help the seals
But where is the breather (vent) that I mxy check it further.

Yes I learned of the car from my mechanic friend, who serviced the car for years. He is a real Mercedes mechanic. :-)
__________________
Thanks for the help
Bill Fisher

'86 560SL (186K) - Now a 'classic' : Registered as an Historic Vehicle
'95 E420 (198K)
'99 E320 (80K)
'03 LS430 (Lexus)
- - - - -
'95 E420 (231K) Sold to a happy buyer, new to Mercedes
'90 300E (65K) Sold to an Mercedes Lover
'92 190E (215K) - retired to the salvage yard, sigh
'93 500SEL (214K) - Moved to another family, still runs like a young pup
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  #8  
Old 10-30-2013, 10:52 PM
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Not a huge believer in marketing...but I've had good luck with Valvoline Maxlife 10W-40 in my 1995 E320. It's not too thick in the winter and it contains some seal conditioners.
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1982 300D-T (sold)
1988 300E (sold)
1994 E320 Wagon (sold)
1995 E320
1998 E300D-T
1999 E3204M Wagon
2001 E320
2005 E320 CDI
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  #9  
Old 10-31-2013, 10:35 AM
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Join Date: Apr 2005
Location: NE Ohio
Posts: 5,034
Quote:
Originally Posted by silverteam View Post
This car was probably serviced by a real Mercedes mechanic and not by DIY. He corrected the crankcase breathing system. This is 50% the problems with the rear engine seal leak. On these older cars don't use synthetic oil before 1998 because these engines where not made for it.

I run synthetic in all the cars.

M103 190E. Leak at timing chain cover. Common leak point regardless of oil type.
OM602 300D. No leaks.
M116 420SEL. No leaks.
OM617 300SD. Leaks at turbo drain, probably a few other places too. Common for leaks regardless of oil type.
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out.
Check here for compatibility, diagnostics, and availability!

(4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!)


82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k
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  #10  
Old 10-31-2013, 03:29 PM
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Location: Philadelphia, PA
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Quote:
Originally Posted by silverteam View Post
Do you think the dealer has real mercedes mechanics? They work all on flat rate, when the car comes in for service they just do what it takes to get it out, and don't check this type of things. They don't have real mercedes mechanics. A real mercedes mechanic has his own shop and trained their mechanics this way. I know it from my repair shop where i bring my cars.
You honestly think an Indy "real MB mechanic" isn't going to make a mistake or fail to miss something either? If you don't do it yourself it never gets done right. Indy's and dealers are incredibly crooked.
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1999 E300 220k
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  #11  
Old 10-31-2013, 03:34 PM
JamesDean's Avatar
Electrical Engineer
 
Join Date: Apr 2005
Location: NE Ohio
Posts: 5,034
Quote:
Originally Posted by jake12tech View Post
You honestly think an Indy "real MB mechanic" isn't going to make a mistake or fail to miss something either? If you don't do it yourself it never gets done right. Indy's and dealers are incredibly crooked.
Not all of them are. The two indy's that I use are honest and fair. I've been going to the same one for our Mercedes since 83' and the same one for our domestics for nearly as long.

__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out.
Check here for compatibility, diagnostics, and availability!

(4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!)


82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k
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