Rear main seal !! - Mustang Evolution

Go Back   Mustang Evolution > 1979-2015 Mustang GT || Tech and Talk > 1996-2004 Mustang GT



Reply
 
Thread Tools Search this Thread
Please support our sponsors and let them know you heard about them here!
Old 09-23-2015, 10:36 AM   #1
Registered Member
Regular
 
smsstang's Avatar
 
Join Date: Sep 2014
Location: houston
Region: Texas
Posts: 238
Rear main seal !!

How much would it cost to replace the rear main seal . Mustang is leaking a tiny bit and it annoys me . I'm thinking it might be the seal . Is it something that can be done in the driveway or would it be better to take it to a shop ? Thanks


Sent from my iPhone using Mustang Evolution
smsstang is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 09-23-2015, 12:18 PM   #2
Staff
Regular
Staff
 
scottydsntknow's Avatar
 
Join Date: Apr 2013
Location: JB MDL
Region: New Jersey
Posts: 16,576
Transmission has to come all the way out. Try a thicker weight oil first IMO. 5w-40 works fine in a modular and no issues with cold starting either.
__________________
2000 Mustang GT Steeda #0048

Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.
scottydsntknow is offline   Reply With Quote
Old 09-23-2015, 12:26 PM   #3
Registered Member
Regular
 
smsstang's Avatar
 
Join Date: Sep 2014
Location: houston
Region: Texas
Posts: 238
Ok I will try that but how much is labor for that usually ?


Sent from my iPhone using Mustang Evolution
smsstang is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 09-23-2015, 12:30 PM   #4
Registered Member
Regular
 
Join Date: Jun 2015
Location: HARTWELL LAKE AREA
Region: South Carolina
Posts: 435
Quote:
Originally Posted by smsstang View Post
How much would it cost to replace the rear main seal . Mustang is leaking a tiny bit and it annoys me . I'm thinking it might be the seal . Is it something that can be done in the driveway or would it be better to take it to a shop ? Thanks


Sent from my iPhone using Mustang Evolution
4 hrs labor,drop transmission and flywheel R&R seal
ALLYDRIVER1 is offline   Reply With Quote
Old 09-23-2015, 12:36 PM   #5
Registered Member
Regular
 
smsstang's Avatar
 
Join Date: Sep 2014
Location: houston
Region: Texas
Posts: 238
So probly 300$ to a shop ?


Sent from my iPhone using Mustang Evolution
smsstang is offline   Reply With Quote
Old 09-23-2015, 12:39 PM   #6
Staff
Regular
Staff
 
scottydsntknow's Avatar
 
Join Date: Apr 2013
Location: JB MDL
Region: New Jersey
Posts: 16,576
No try $500-$600




For a $30 part...
__________________
2000 Mustang GT Steeda #0048

Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.
scottydsntknow is offline   Reply With Quote
Old 09-23-2015, 01:01 PM   #7
Registered Member
Regular
 
smsstang's Avatar
 
Join Date: Sep 2014
Location: houston
Region: Texas
Posts: 238
That hurts my feelings a little bit lol well luckily I work for a shop that has good contacts . Is there any brand seal that's recommended or does that not really matter in this case .


Sent from my iPhone using Mustang Evolution
smsstang is offline   Reply With Quote
Old 09-23-2015, 01:20 PM   #8
Staff
Regular
Staff
 
scottydsntknow's Avatar
 
Join Date: Apr 2013
Location: JB MDL
Region: New Jersey
Posts: 16,576
Not really.


Again, I would try a thicker weight oil first. It could very well fix the problem. 20 weight stuff is like water...
__________________
2000 Mustang GT Steeda #0048

Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.
scottydsntknow is offline   Reply With Quote
Old 09-23-2015, 01:25 PM   #9
Registered Member
Regular
 
smsstang's Avatar
 
Join Date: Sep 2014
Location: houston
Region: Texas
Posts: 238
Okay I will try the 5w40 then this just happened recently after the oil change I got so I will go try that out .


Sent from my iPhone using Mustang Evolution
smsstang is offline   Reply With Quote
Old 09-23-2015, 07:09 PM   #10
Registered Member
Regular
 
Join Date: Mar 2013
Location: Salinas
Region: California
Posts: 7,401
If they used a full synthetic oil, that can cause oil leaks on high mileage engines. Even synthetic "blends" can cause leaks. Synthetic oil can find it's way out of the tiniest little hole.
I would try a conventional oil and maybe use a 5W30.
straybullitt is offline   Reply With Quote
Old 09-23-2015, 07:12 PM   #11
Registered Member
Regular
 
Join Date: Jun 2015
Location: HARTWELL LAKE AREA
Region: South Carolina
Posts: 435
Quote:
Originally Posted by straybullitt View Post
If they used a full synthetic oil, that can cause oil leaks on high mileage engines. Even synthetic "blends" can cause leaks. Synthetic oil can find it's way out of the tiniest little hole.
I would try a conventional oil and maybe use a 5W30.

true that^^^^
ALLYDRIVER1 is offline   Reply With Quote
Old 09-23-2015, 07:13 PM   #12
Registered Member
Regular
 
smsstang's Avatar
 
Join Date: Sep 2014
Location: houston
Region: Texas
Posts: 238
Yeah I used Mobil 1 synthetic . What good conventional oil do you recommend ?


Sent from my iPhone using Mustang Evolution
smsstang is offline   Reply With Quote
Old 09-23-2015, 07:16 PM   #13
Registered Member
Regular
 
Join Date: Mar 2013
Location: Salinas
Region: California
Posts: 7,401
I have had the same problem with Mobil 1.
Try a blend first. I like Motorcraft.
straybullitt is offline   Reply With Quote
Old 09-23-2015, 07:21 PM   #14
Registered Member
Regular
 
smsstang's Avatar
 
Join Date: Sep 2014
Location: houston
Region: Texas
Posts: 238
Like are you meaning half in half when you say blend ? And is motor raft a good brand to use ? It sucks cause the place o got my oil change at put the wrong stuff in then what I had ask them to put in it then out of no where starts leaking on brand new house drive way . Lol


Sent from my iPhone using Mustang Evolution
smsstang is offline   Reply With Quote
Old 09-23-2015, 07:25 PM   #15
Registered Member
Regular
 
Join Date: Mar 2013
Location: Salinas
Region: California
Posts: 7,401
Yes. A blend is part conventional and part synthetic.
Motorcraft is a good oil...But almost any brand is good nowadays!

Simple Green works good on driveway stains.
straybullitt is offline   Reply With Quote
Old 09-23-2015, 07:31 PM   #16
Registered Member
Regular
 
smsstang's Avatar
 
Join Date: Sep 2014
Location: houston
Region: Texas
Posts: 238
Okay sweet and yes I have simple green so I need to get to scrubbing and I guess I will get motorcraft conventional 5w30 thanks man


Sent from my iPhone using Mustang Evolution
smsstang is offline   Reply With Quote
Old 09-23-2015, 07:38 PM   #17
Registered Member
Regular
 
Join Date: Mar 2013
Location: Salinas
Region: California
Posts: 7,401
No problem!

Try their Synthetic Blend first. Or something that says it is for high mileage engines.
If that doesn't work, then you can try a straight conventional.
straybullitt is offline   Reply With Quote
Old 09-23-2015, 08:07 PM   #18
Registered Member
Regular
 
parkerz28's Avatar
 
Join Date: Apr 2014
Posts: 321
That's a myth... Synthetic oils don't cause leaks out of conventional seals...


Sent from Rapinators trunk
parkerz28 is offline   Reply With Quote
Old 09-23-2015, 08:18 PM   #19
Registered Member
Regular
 
Join Date: Mar 2013
Location: Salinas
Region: California
Posts: 7,401
Quote:
Originally Posted by parkerz28 View Post
That's a myth... Synthetic oils don't cause leaks out of conventional seals...


Sent from Rapinators trunk
Are you saying that my real world experience, not something that I read on the internet, is incorrect?
straybullitt is offline   Reply With Quote
Old 09-23-2015, 08:50 PM   #20
Registered Member
Regular
 
Join Date: Jun 2015
Location: HARTWELL LAKE AREA
Region: South Carolina
Posts: 435
Quote:
Originally Posted by parkerz28 View Post
That's a myth... Synthetic oils don't cause leaks out of conventional seals...


Sent from Rapinators trunk
in a word bull****, put synthetic oil in a 100k car with no leak and will be leaking from every orifice with-in 100 miles
ALLYDRIVER1 is offline   Reply With Quote
Old 09-23-2015, 09:44 PM   #21
Registered Member
Regular
 
Join Date: Mar 2013
Location: Salinas
Region: California
Posts: 7,401
No guarantees that changing the oil will solve the problem, but I would certainly give it a try before changing the seal.

I put about 3 quarts of Mobile 1 into my truck engine when it had around 300k on it. It started leaking almost immediately. I changed the oil back to Castrol High Mileage, which is a synthetic blend, and it stopped. That engine is still in my truck, with 410k, and no leaks!
I also had an airless paint sprayer powered by a Honda engine. On the very first oil change, I used Mobil 1, and it also started leaking almost immediately. I kept using synthetic in that little engine because it got used long and hard, with very little maintenance.

Also, OP, check the oil level and make sure that the crank case isn't over filled.
straybullitt is offline   Reply With Quote
Old 09-24-2015, 06:01 AM   #22
Registered Member
Regular
 
parkerz28's Avatar
 
Join Date: Apr 2014
Posts: 321
Quote:
Originally Posted by ALLYDRIVER1 View Post
in a word bull****, put synthetic oil in a 100k car with no leak and will be leaking from every orifice with-in 100 miles

My formula firebird had over 200k on it all I used was mobile 1. No leaks my Camaro had 150k no leaks so they must of been ... Cough... Special I guess lmao


Sent from Rapinators trunk
parkerz28 is offline   Reply With Quote
Old 09-24-2015, 07:34 AM   #23
Staff
Regular
Staff
 
scottydsntknow's Avatar
 
Join Date: Apr 2013
Location: JB MDL
Region: New Jersey
Posts: 16,576
Quote:
Originally Posted by parkerz28 View Post
My formula firebird had over 200k on it all I used was mobile 1. No leaks my Camaro had 150k no leaks so they must of been ... Cough... Special I guess lmao


Sent from Rapinators trunk
What exactly is your point? You had two cars with good seals that didn't go bad. I'm not saying if you put synthetic in a vehicle with conventional after 100k it will always leak 100%... but if you have a vehicle leaking a little with syn and switch to a blend or regular dino... well I've seen that cure work myself personally IRL.
__________________
2000 Mustang GT Steeda #0048

Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.
scottydsntknow is offline   Reply With Quote
Old 09-24-2015, 08:10 AM   #24
Registered Member
Regular
 
parkerz28's Avatar
 
Join Date: Apr 2014
Posts: 321
Quote:
Originally Posted by scottydsntknow View Post
What exactly is your point? You had two cars with good seals that didn't go bad. I'm not saying if you put synthetic in a vehicle with conventional after 100k it will always leak 100%... but if you have a vehicle leaking a little with syn and switch to a blend or regular dino... well I've seen that cure work myself personally IRL.

My point had nothing to do with what you said


Sent from Rapinators trunk
parkerz28 is offline   Reply With Quote
Old 09-24-2015, 11:12 AM   #25
Registered Member
Regular
 
Join Date: Jun 2015
Location: HARTWELL LAKE AREA
Region: South Carolina
Posts: 435
Quote:
Originally Posted by parkerz28 View Post
My point had nothing to do with what you said


Sent from Rapinators trunk
and what was your point,doesn't make a lot of sense
ALLYDRIVER1 is offline   Reply With Quote
Old 09-24-2015, 11:24 AM   #26
Registered Member
Regular
 
parkerz28's Avatar
 
Join Date: Apr 2014
Posts: 321
Quote:
Originally Posted by ALLYDRIVER1 View Post
and what was your point,doesn't make a lot of sense

I simply said you could run synthetic oil in a vehicle with over 100k miles and provided 2 examples from my own experience. I'm not sure what is confusing about it.


Sent from Rapinators trunk
parkerz28 is offline   Reply With Quote
Old 09-24-2015, 12:02 PM   #27
Staff
Regular
Staff
 
scottydsntknow's Avatar
 
Join Date: Apr 2013
Location: JB MDL
Region: New Jersey
Posts: 16,576
Because it sounded like sarcasm.
__________________
2000 Mustang GT Steeda #0048

Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.
scottydsntknow is offline   Reply With Quote
Old 09-24-2015, 05:07 PM   #28
Registered Member
Regular
 
ddtmoto's Avatar
 
Join Date: Nov 2012
Region: Utah
Posts: 158
Reseal AT-205 from ATP....works well. Amazon has it, I can't find it locally.
ddtmoto is offline   Reply With Quote
Old 09-25-2015, 12:04 AM   #29
Registered Member
Regular
 
robb15033's Avatar
 
Join Date: Oct 2010
Location: Northern Virginia
Region: Virginia
Posts: 2,109
Oh, Boy-
*Motorcraft Semi-Synthetic is an excellent oil, but doubt it would stop a rear seal leak.
*I believe that "High Mileage" oils are used with intention of only using it for a 3K-5K mile interval, drain, return to conventional oil and monitor.
*Don't use any oil additives that "Fix Oil Leaks".
*Check out BITOG for some educated opinions.
*Call local Mustang shop, and again, listen to Mustang experienced technicians opinions. Ask "What Causes This Particular Seal Leak" , if there is any, hereditary causes, that is... & what say you?-
Best O Luck!
I'll Be Monitoring This THREAD,
-----------------------------------------------------------------

JUST MY
~Please Update, I wanna know what to do too.
__________________
'97 3.8L V6
Pacific Green
1996 SVT Cobra White
robb15033 is offline   Reply With Quote
Old 09-25-2015, 06:49 AM   #30
Staff
Regular
Staff
 
scottydsntknow's Avatar
 
Join Date: Apr 2013
Location: JB MDL
Region: New Jersey
Posts: 16,576
He said it was just a few drops. Going to a blend or a higher weight could band aid it for awhile. Hell, going 40 weight stopped a leaky cam seal on my wife's Honda and it hasn't come back for 20k...
__________________
2000 Mustang GT Steeda #0048

Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.
scottydsntknow is offline   Reply With Quote
Old 09-25-2015, 11:04 AM   #31
Registered Member
Regular
 
fenixignition's Avatar
 
Join Date: Nov 2014
Location: Clearwater, fl
Region: Florida
Posts: 1,050
gonna beat a dead horse here for a bit, but last i heard, which was from engineers at valvoline (possibly pennzoil) that the molecules in a synthetic oil are made the same size as ones in a conventional, and pretty much debunked that myth. The best ive always figured, is that synthetic oil has more detergents in them, and clean out the cracks filled with old buidup, thus, leaks. I know one of you said that you went from castrol, to mobil 1, and back to castrol, and experienced leaks only with mobil 1. all i know is that mobil1 is slightly thinner than castrol conventional. even if they are both 5w30. but its a minimal difference. cant really explain what happened there.
__________________
2002 GT 5sp. 16x,xxx miles
Steeda Exhaust, C&L plenum, BBK Throttle Body, Steeda Underdrive, Steeda short throw, unknown stage clutch. Rear main leak. Compressor seal leak. Steeda lower control arms. good tires.
fenixignition is offline   Reply With Quote
Old 09-25-2015, 02:46 PM   #32
Staff
Regular
Staff
 
scottydsntknow's Avatar
 
Join Date: Apr 2013
Location: JB MDL
Region: New Jersey
Posts: 16,576
I just use Rotella T6 in everything. 5w-40, super heavy duty oil, not too expensive and available everywhere. Motorcraft or WIX filter and call it a day.
__________________
2000 Mustang GT Steeda #0048

Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.
scottydsntknow is offline   Reply With Quote
Old 09-25-2015, 04:49 PM   #33
Registered Member
Regular
 
smsstang's Avatar
 
Join Date: Sep 2014
Location: houston
Region: Texas
Posts: 238
I will just try a thicker oil like Scotty is recommending and see what happens . If it continues then looks like I will just get the new seals


Sent from my iPhone using Mustang Evolution
smsstang is offline   Reply With Quote
Old 09-25-2015, 07:36 PM   #34
Registered Member
Regular
 
Join Date: Mar 2013
Location: Salinas
Region: California
Posts: 7,401
Synthetic oil is more "slippery" than conventional oil...Especially when it is cold! Combine that with the first number in the recommended oil weight for our engines (5), and a seal that has had a crankshaft spinning around inside of it for tens of thousands of miles...And I am going to stick to my theory that synthetic oil will indeed find its way out of a seal that will not leak with conventional oil.
I'd be willing to bet that OP's engine does not leak a drop of oil while the engine is running and warmed up. It is when the oil is cold, and at it's thinnest viscosity, that it is leaking. Hence, the spots on his driveway.
straybullitt is offline   Reply With Quote
Old 09-26-2015, 03:45 PM   #35
Registered Member
Regular
 
fenixignition's Avatar
 
Join Date: Nov 2014
Location: Clearwater, fl
Region: Florida
Posts: 1,050
its actually thicker when it is cold. or more viscous for that matter.
it has the viscosity index of a 5 weight oil when it is cold, maybe even at freezing temp or 0F. as it warms up, the structure (at a microscopic level) changes, and has properties of a 30 weight. (or 20 or 40 or 50, whatever your using). the viscosity rating at 40C for mobil1 5w30 is 61.7, and at 100C its 11.7.
I am under the impression that the lower the viscosity level, the thinner the oil. please correct me if i am wrong. but that would explain why people say the oil flows better when your draining it if you warm it up first.
also just an fyi, 5w30 vs 5w20 at operating temp, i believe is 8. something vs 11.7. slightly thinner.
__________________
2002 GT 5sp. 16x,xxx miles
Steeda Exhaust, C&L plenum, BBK Throttle Body, Steeda Underdrive, Steeda short throw, unknown stage clutch. Rear main leak. Compressor seal leak. Steeda lower control arms. good tires.
fenixignition is offline   Reply With Quote
Reply

Lower Navigation
Go Back   Mustang Evolution > 1979-2015 Mustang GT || Tech and Talk > 1996-2004 Mustang GT

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Rear Main Seal or Oil Pan Gasket leak? DutchManDann 1996-2004 Mustang GT 16 03-10-2015 09:42 AM
Rear Main Seal BigB227 1996-2004 Mustang GT 2 02-27-2012 06:27 PM
Rear Main Seal? ColeJohnson 1996-2004 Mustang GT 5 02-10-2012 08:39 AM
Rear main seal replacement? 90Stang_5.0 1979-1995 Mustang GT 8 11-18-2011 02:50 PM
Rear main seal jhagan1980 General Mustang Discussion 0 11-04-2011 08:09 AM

» Like Us On Facebook



10:04 AM


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0

MustangEvolution.com is in no way associated with or endorsed by Ford Motor Company.