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1988 cadillac brougham oil disappearing #5196242 08/25/19 01:41 PM
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momo Offline OP
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Hi all,

I noticed whenever I check the dipstick after ~200 miles, it shows that approximately 1 quart less. I don't drive that much since it sits on the garage most of its life. I did not notice any leak under the car. I usually change the oil once a year and I had to refill the oil every time that I noticed the dipstick showed low level. I checked the pcv valve and its associated parts nothing out of ordinary (e.g., smell of gas and little bit of dirt). I checked the oil pan thoroughly no seeping or leak. I checked the valve covers (from the front and sides) and no seeping or leak.

Any advice?

My questions are also:
1- Would it be possible that I find some blockage in the head that prevents the oil from going back to the oil sump?
2- Since the car run perfect and I haven't noticed heavy smokes coming from the tail pipe (except white smoke when first starting the car after a while), do you think that it maybe the case where the car burns oil?
3- Where should I start to trace this problematic issue I have?


Thanks


Last edited by momo; 08/25/19 01:41 PM.

'83 Toyota Cressida VWB 5w30 & Denso
'88 Cadillac Brougham d'Elegance VWB 5w30 & Wix gold
'15 Honda Odyssey Castrol Edge 0w20 & Proselect


Re: 1988 cadillac brougham oil disappearing [Re: momo] #5196250 08/25/19 01:56 PM
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Trav Offline
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You may have a leaking oil pressure sending unit that leaks under higher pressure that that at idle and leaves it on the road as you drive. If it is damp or wet change it.

The ones from WVE are good, they are NGK/NTK and only about 7 bucks.

https://www.rockauto.com/en/moreinfo.php?pk=939311&cc=1027145&jsn=424

Last edited by Trav; 08/25/19 01:59 PM.

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Re: 1988 cadillac brougham oil disappearing [Re: momo] #5196259 08/25/19 02:10 PM
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oldhp Offline
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If your losing 1qt in 200 miles the underside would be soaked with oil. Maybe pull the plugs and see what they look like.

Last edited by oldhp; 08/25/19 02:10 PM.

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Re: 1988 cadillac brougham oil disappearing [Re: momo] #5196267 08/25/19 02:20 PM
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JLTD Offline
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How many miles? Head gasket may be your culprit, since there are no leaks. Is the inside of your tailpipe greasy?


I use the overseas manual to choose my oil viscosity.

Using AMSOIL

Hers: 2008 Jeep Liberty 149k, SS5w30/Amsoil

His: 2015 4Runner 55k, SS 5w20/Amsoil

Re: 1988 cadillac brougham oil disappearing [Re: Trav] #5196651 08/25/19 10:08 PM
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momo Offline OP
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Originally Posted by Trav
You may have a leaking oil pressure sending unit that leaks under higher pressure that that at idle and leaves it on the road as you drive. If it is damp or wet change it.

The ones from WVE are good, they are NGK/NTK and only about 7 bucks.

https://www.rockauto.com/en/moreinfo.php?pk=939311&cc=1027145&jsn=424


Let me check this


'83 Toyota Cressida VWB 5w30 & Denso
'88 Cadillac Brougham d'Elegance VWB 5w30 & Wix gold
'15 Honda Odyssey Castrol Edge 0w20 & Proselect


Re: 1988 cadillac brougham oil disappearing [Re: oldhp] #5196653 08/25/19 10:10 PM
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momo Offline OP
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Originally Posted by oldhp
If your losing 1qt in 200 miles the underside would be soaked with oil. Maybe pull the plugs and see what they look like.


Well last time, probably 2 years ago, I changed the plugs weren't that bad. But I will check 'em again


'83 Toyota Cressida VWB 5w30 & Denso
'88 Cadillac Brougham d'Elegance VWB 5w30 & Wix gold
'15 Honda Odyssey Castrol Edge 0w20 & Proselect


Re: 1988 cadillac brougham oil disappearing [Re: JLTD] #5196657 08/25/19 10:13 PM
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momo Offline OP
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Originally Posted by JLTD
How many miles? Head gasket may be your culprit, since there are no leaks. Is the inside of your tailpipe greasy?


70K miles on the clock. Well this is very interesting as I noticed the other day there is wet residual that come from the tail pipe but it was watery rather than greasy


'83 Toyota Cressida VWB 5w30 & Denso
'88 Cadillac Brougham d'Elegance VWB 5w30 & Wix gold
'15 Honda Odyssey Castrol Edge 0w20 & Proselect


Re: 1988 cadillac brougham oil disappearing [Re: momo] #5196669 08/25/19 10:30 PM
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Propflux01 Offline
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Prolly falling through the valve seals.I had a Grand Prix do that, ate a quart every 800 miles and never saw smoke. Blow by was pretty rough though. always found oil in the breather element.


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Re: 1988 cadillac brougham oil disappearing [Re: momo] #5196844 08/26/19 07:45 AM
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Hootbro Offline
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Originally Posted by momo


70K miles on the clock. Well this is very interesting as I noticed the other day there is wet residual that come from the tail pipe but it was watery rather than greasy


a little bit of water out of the tail pipe on startup is normal until it warms up. If you had a coolant leak making it's way to the exhaust, it would be white smoke and a classic blown head gasket situation which yours does not sound like.


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