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Administrator
2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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67,179 Posts
DO NOT use "sealer" or other snake oils in engine oil. Fix the weep/leak correctly. You are almost guaranteed to make things worse with snake oils. Very possible that a seal will swell too much and be torn from excess friction.

Find the leak and repair it correctly. Oil on the right (rear) exhaust manifold - or where? Correct location makes a big difference in diagnosis.
 

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Super Moderator
White Diamond '03 DHS (with DTS floor shift)
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86,310 Posts
Are you sure it is oil and not coolant mixed with oily exhaust carbon or just dirty condensate?
 

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Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
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18,909 Posts
as Sub said - leave the SNAKE OIL on the shelf - it CAUSES more problems in the long run -

the MOST common oil leaks are from a defective OPS - Oil Pressure Switch / oil filter adapter seal -
AND the rear cam cover -
 

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Registered
99 deville
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3 Posts
Discussion Starter #5
I have an oil pressure switch and filter adapter housing gasket coming this weekend.
Drove 1300 mi and replaced 3 qts of oil.
Love the car and will keep fixing it.
Could not find the sticker to identify the head bolts on this car.
RR pass side rocker?
This is an 04 Deville with 101,000 mi. Base model.
 

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Administrator
2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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67,179 Posts
Do you still own/drive the listed 1999 Deville? Please update your profile. Thanks.

The head 2004 Northstar bolt specs are in the GM/Cadillac/Helm service manuals. Nowhere on or in the car itself.

Here's a 2003 and later Northstar oil filter adapter gasket assembly. VERY different from the pre-2003 O-ring setup.

oil filter adapter late gasket.jpg
 

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Registered
99 deville
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3 Posts
Discussion Starter #7
Jacked the car sky-hi today.
Adapter and sensor are ok.
Seems like the back valve cover gasket smokes the most.
So did not replace. Found a missing motor mount bolt and a loose trany mount bolt.
Replaced and tightened the other.
Replaced right rack and pinion boot also.
Looking at the valve cover gaskets next. All seem to have a 1 yr warranty.
Does anyone recommend sealer on the bottom of these silicone gaskets?
Thanks Dave.
 

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2004 Deville base
'05 SRX N*/AWD, Vetts/Birds/Trucks
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391 Posts
2004 engine assembly tag pics post #17&25
Great thread for 2004 owners.


Cam covers might depend on gasket as to silicone sealer. I usually go with dry, they look like silicone(fel-pro blue) to avoid non-compatible materials and a likely big mess. Plus I hate cleaning stuff up if I have to go back in.
There are some corners that need it.
 
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