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rear main seal leaking like hell- additives work??

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Old Jun 12, 2002 | 11:22 AM
  #1  
johndinu's Avatar
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From: Montreal, QC, CANADA
Car: '89 GTA 350 hardtop
rear main seal leaking like hell- additives work??

Hi!
My seal leaks some 1 liter of oil(or more) every 1000 km or so. Given the extensive work needed to replace the damn seal and the fact that I can`t do it myself i thought just to add oil all the time...
now, are those oil additives (for leaking seals) any good or they just gonna fill my oil system with junk deposits?

Thanks!!
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Old Jun 12, 2002 | 11:47 AM
  #2  
rsc350's Avatar
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From: Saint Cloud, FL
Car: 92 Camaro RS
Engine: 350
Transmission: 700R4
Axle/Gears: 3.73 Truetrac
if you broke your leg really bad would you walk around on it take some pills and some wonder cure, or would you go to the doctor to get it done right, Well that could be a bad example, doctor mechanic neither one knows squat when it comes to technical things about there profession, I would never dump anything in my engine except oil, maybe an aditive but never a can-o-fix it all.
Just my$.02 though some guys swear by that stuff. I would rather get it done right and call it a day.
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Old Jun 12, 2002 | 04:51 PM
  #3  
86IROCZ's Avatar
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From: Prescott, AZ
I too, have a limited apreciation for "magic" potions. If only auto maintenance was that easy!!
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Old Jun 12, 2002 | 06:15 PM
  #4  
89BlueTA's Avatar
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From: Tecumseh,Mi,USA
I tell you guys, I never believed in those things either. But my truck was leaking like so bad out of the rear main that I had to do something. I would have a puddle after idling for 5 minutes. So I tried some of that CD-2 stop leak and it worked great, it almost totally stopped the leak. It got it down to just a drop every once in a while, and it has lasted for 50,000 miles. It was a lot less hassle then replacing the seal and it worked great. I did not have much faith in the stuff when I tried it, but it worked. So now I believe.

nick
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Old Jun 12, 2002 | 11:16 PM
  #5  
ME Leigh's Avatar
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From: Valley of the Sun
Car: 82 Z28
Engine: Al LT1 headed LG4 305
Transmission: TH350
Axle/Gears: 3.73 posi with spacer
Just put some 50-W oil in the next oil change and i'm certain the problem will be slowed!
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Old Jun 13, 2002 | 07:41 AM
  #6  
johndinu's Avatar
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From: Montreal, QC, CANADA
Car: '89 GTA 350 hardtop
thanks for your replys!

at the next oil change I`ll use 10w30 instead of 5w30...
then I`ll wait untill my tranny lets go to change the seal too!!
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Old Jun 13, 2002 | 12:29 PM
  #7  
TomP's Avatar
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From: Central NJ, USA
Car: 1986 Firebird
Engine: 2.8 V6
Transmission: 700R4
Do you V8'ers have the same chronic problem us 2.8/3.1 V6 guys do? The distributor o-ring seal gets old, dries up, cracks, and we get an oil leak down the back of the engine, around the rear of the crank, and onto the ground. If you pull the flywheel inspection cover, the oil appears to be dripping right from the rear seal.

A "5 for 1.00" bag of 1 inch inside diameter o-rings fixes the problem for us 2.8/3.1 guys. Does the same thing happen on the V8's?
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Old Jun 13, 2002 | 02:57 PM
  #8  
StngKlr's Avatar
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Joined: Jul 2001
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From: Paris, Tx. USA
Car: 89 RS
Engine: LS1
Transmission: TH350
I've never had the dist. gasket leak before so I dont know about that. But its worth looking at.

Now I do know a leaky oil pressure sender will have you swearing that you have a rear main seal leak. They look very similar. The last time I replaced the tranmission, I figured I'd go ahead and change the rear main seal while I was at it. Pulled the tranny and saw no signs of oil leaking from anywhere in there. So after further inspection I determined that this little cylinder looking thing (oil pressure sender) was dripping oil out the side of itself. Damn thing cost me about $200 in oil, over a six month period. So, long story short, paid about $10.00 for a new sender and I havent seen a drop of oil (motor) since. Now power steering is another story. Oh, the sender is located on the drivers side near the dist. and the firewall. Mine had a orange wire with a connector plugged into it.

Check it out, its worth a shot. I dont like idea of some Snake Oil fixing my problem either. Hope this helps.

Last edited by StngKlr; Jun 13, 2002 at 02:59 PM.
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Old Jun 16, 2002 | 02:54 PM
  #9  
dwish8990's Avatar
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From: New Jersey
Originally posted by TomP
Do you V8'ers have the same chronic problem us 2.8/3.1 V6 guys do? The distributor o-ring seal gets old, dries up, cracks, and we get an oil leak down the back of the engine, around the rear of the crank, and onto the ground. If you pull the flywheel inspection cover, the oil appears to be dripping right from the rear seal.

A "5 for 1.00" bag of 1 inch inside diameter o-rings fixes the problem for us 2.8/3.1 guys. Does the same thing happen on the V8's?
this is exactly what was wrong on my 1991 v6 bird, distributor o-ring relaced and the problem was fixed. I was leaking about a quart of oil a week before that.
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