ZO6guy

I know some of you all will scold me for telling this but I have had my Z in Strage since December and I backed it out of the garage the other day and noticed a pool of oil on the floor. I was shocked since this car only has 4500 miles on it. I have not had a change to look underneath to see where it might be coming from. But my first guess would be rear main seal. I let it run the other day and it isn't leaking on anything that could burn it off either. Now I let it sit in my driveway and it didn;t leak a drop after letting run for 20 minutes. She doesn't come out of storage until Memorial day weekend but I am thinking I may need to trailer her to the dealership to be looked at.

Has anyone experienced this?

This really bothers me! I have a 03 GMC HD and it has 95K on it and does't leak a drop.

Any feedback would be apreciated!

CraZee ZO6

maybe something is leaking.. need to get it on the lift to check.

LEJ ZO6

No leaks here.

I don't read everything on the ZO6 Forum but I haven't heard of this as a common complaint.

You're just (un)lucky I guess.

patton

was it motor oil ? where under car ? what color ? how many miles ? are any fluids low ? wheres waldo ?

ZO6guy

Reread my thread!

4500 miles - it was motor oil. I know my way around a automobile!

GN1270

I think it would make more sense for you to find the leak before guessing where it may be, at least get the general area. You could have clipped a hose going to the dry sump, could be a loose filter or drain plug backing out, and yes it could be a rear main seal leak, could be a valve cover leak and it could be none of those. A lift should tell you in a matter of minutes.

ISLANDBOY2

I have a 2008 Z06, purchased in 11/28/07. I found some oil drops in the back. Placed a card board and found drops once in awhile. Placed the car on ramps and found the rear leaf oily. Wipe the oil off and once after several rides oil would again puddle up on the leaf and drop to the floor. Don't know if this is a seal problem. Had a similar problem with a 1999 coupe, automatic.

CodyC6

Here is a TSB I listed for the LS2 folks, but it applies to many of the GM engines.

Subject: 5.3L LC9, LS4, L33, LH6, LM4, 5.7L LS1, LS6, 6.0L LS2, L76, 6.2L L92, 7.0L LS7 - Engine Oil Leak at Rear Cover Assembly Area (Engine Block Porosity RTV Repair Procedure) #05-06-01-034E - (02/12/2007)


Models: 2004-2007 Buick Rainier

2005-2007 Cadillac CTS-V

2007 Cadillac Escalade, Escalade ESV, Escalade EXT

2003-2007 Chevrolet Corvette, TrailBlazer

2004-2006 Chevrolet SSR

2005-2007 Chevrolet Silverado, Silverado SS

2006-2007 Chevrolet Impala SS, Monte Carlo SS, TrailBlazer SS

2007 Chevrolet Avalanche, Suburban, Tahoe

2003-2007 GMC Envoy, Sierra

2004-2005 GMC Envoy XUV

2007 GMC Yukon XL, Yukon Denali, Yukon XL Denali

2004-2006 Pontiac GTO

2005-2007 Pontiac Grand Prix GXP

2005-2007 Saab 9-7X

with 5.3L, 5.7L, 6.0L, 6.2L, 7.0L VORTEC™ GEN III or GEN IV V8 Engine (RPOs LC9, LS4, L33, LH6, LM4, LS1, LS6, LS2, L76, L92, LS7)

--------------------------------------------------------------------------------

This bulletin is being revised to update warranty information. Please discard Corporate Bulletin Number 05-06-01-034D (Section 06 -- Engine/Propulsion System).


--------------------------------------------------------------------------------

Condition
Some customers may comment on an engine oil leak.

Cause
Upon initial diagnosis, it may be determined that the leak is coming from the rear cover gasket. This condition may be caused by engine block porosity on the sealing surface. This issue pertains to aluminum block applications only.

Correction
Follow the steps for Oil Leak Diagnosis in SI to determine the source of the leak. If the leak has been diagnosed as coming from the engine rear cover assembly, refer to Engine Rear Cover Replacement in SI and remove the engine rear cover assembly. Inspect for engine block porosity where the engine rear cover mates to the engine block. If porosity is found anywhere on the sealing surface, use the following procedure to apply RTV to repair the engine block porosity. Refer to the illustration below.


Important: Clean any residual oil from the block and cover before applying the sealant in the next step.

Wipe a small amount of RTV, P/N 12378521 (in Canada, use P/N 88901148), onto the surface using a plastic scraper to fill the porosity.
Remove any excess RTV material, especially from inside the high pressure oil passage. Refer to #1 in the above illustration.
The joint may be closed immediately after applying the RTV. Total joint time after the RTV has been applied must be under 20 minutes.
Important: Refer to Engine Rear Cover Replacement in SI and follow the tightening specifications and sequence.

Reinstall the engine rear cover using a new gasket and a new crankshaft rear main seal. Refer to Engine Rear Cover Replacement in SI.
Parts Information
Important: For Saab (U.S.) only, use P/N 12345795, Engine Oil Dye (U.S.), or equivalent.

Part Number
Description
Qty

12574293
Gasket - Crankshaft Rear Oil Seal Housing
1

89060436
Seal, Crankshaft Rear Main
1

12378521 (U.S.)

88901148 (Canada)
Sealant
1

12345795 (U.S.)
Dye, Engine Oil
1

10953470 (Canada)
Dye, Engine Oil
1


Warranty Information
Excluding Saab U.S. Models
For vehicles repaired under warranty, use:

Labor Operation
Description
Labor Time

J7510*
Oil Leak -- Rear Cover Area -- Porosity Repair

CTS-V
5.5 hrs

Corvette

- M/T

- A/T


5.9 hrs

5.4 hrs

SSR
5.4 hrs

TrailBlazer/Envoy/Rainier/Saab 9-7X (Canada)

- 2WD

- 4WD


5.7 hrs

6.5 hrs

GTO

- M/T

- A/T


10.2 hrs

10.5 hrs

Grand Prix/Impala/Monte Carlo
5.7 hrs

Silverado//Sierra Models

- M/T

- A/T


4.5 hrs

5.5 hrs

Avalanche, Escalade, Suburban, Tahoe, Yukon Models
4.5 hrs

Add
With skid plate
0.2 hr

With HP2**
0.5 hr

To clean parts over 48,000 km (30,000 mi)
0.1-0.3 hr

* This labor operation is for bulletin use only. It will not be published in the Labor Time Guide.

** HP2 Hybrid Propulsion Electric, AHS2


Saab U.S. Models
For vehicles repaired under warranty, use:

Labor Operation
Description
Failed Object
Fault/Reason Code
Location Code
Warranty Type
Repair/Action Code
Labor Time

2161901
Replace part, Seal, End Plate V8 T-Truck
21619
57
0
01
01
6.5 hrs

Add

9821001
R&R Anti-Submarine (Skid) Plate
--
--
--
--
--
0.2 hr

Add
To clean parts over 48,000 km (30,000 mi)
--
--
--
--
--
0.1 to 0.3 hr in 99 time




GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION


© Copyright General Motors Corporation. All Rights Reserved.

mongol7112000

I found oil hanging off my starter and transmision lines, and all over the bottom of the oil pan.

Do you think this is it?

seamus2154

I have read in the past of someone w/ your complaint and it was the dry sump lines at the connection. Give a look. When I have had a leak and it in several spots I clean everything w/ brake cleaner, dry it and then monitor it everyday till I can see exactly where it is coming from. You'd be surprised sometimes where it comes from and where it ends up. And use a bright light when monitoring.

Bill Dearborn

The oil cooler line on my 08Z started leaking last year. The leak occurred where the line changes over from metal to hose. The hoses are crimped to the aluminum line coming from the back of the block. The leak was right over the front spring on the driver's side. Without getting under the car it was hard to tell where the leak was since the oil sort of sprayed everywhere.

Bill

Turbooo2u

To the OP. This happened to my 07' also, same circumstances. Dealer knows what to do (apparently) and it will be fixed under warranty. That or some other TSB applies. Call the dealer and make sure they're familiar with the TSB. Good luck.

FrankTank

This thread is from 2008 I would hope his oil leak has been fixed over the past 3 years


Mods should lock it.

Landru

Amoung the things suggested, I've read several posts here on the Z06 side of people complaining about a leaking oil pan gasket. Supposedly a real PITA to replace that gasket, nevermind expensive.

Your car's [hopefully] still covered by warranty, so get it to your dealer to have this remedied. Whatever it is.

Lawdogg

Every year mine comes out of storage after 4 to 5 months of sitting still it has oil on the ground under the engine. (left side). Everything has been checked and everything on the engine is dry. Never leaks a drop all summer, no oil stain on the motor. My guess is some seepage from an oil line after extended periods of sitting. Now I just wipe up the floor and forget about it.

Turbooo2u

I'm learning some new info with this thread. If you don't like it, why waste your time commenting??

TxPres

z51vett

See David fulcher at Jim Ellis chev. he will take care of it.
z51vett

chasboland

exactly what i have experienced for the past 3yrs of owning the Z.
no oil leak all summer but when it sits for the winter the a few drops always appear.

Turbooo2u

But during the summer, do you see any "weeping bolts" or any wetness on the oil pan and surrounding areas?