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  #1  
Old 03-08-2008, 12:41 AM
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Exclamation Emergency! Help! Just Oil Pressure Issue!

I have noticed that my 75 450 SL loses oil pressure while running or the guage is messed up. Car runs alittle roungh when I do notice this. I remember that Oil Pressure guage should be burried at the max while running. Is there a reason if I am losing pressure? Is it the Oil pump? Is that a common failure? Please help. I am like what do I do???

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Timothy Evans
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CELL 310 990 6780


1985 380 SL
2010 CL 6.3 AMG
*2009 CL 550 Sport 4matic
New addition-1984 380 SE
Newest Edition 1986 300E AMG
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  #2  
Old 03-08-2008, 08:31 AM
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Originally Posted by Tims450SL View Post
I have noticed that my 75 450 SL loses oil pressure while running or the guage is messed up.
When I first start my car, the gauge is buried even at idle. If I'm driving it on a fairly cold day (40F) it stays at or above 2 bar and buries itself as soon as I press the gas. If I'm driving on a hot day (90F+) it can get as low as just over 1 bar at idle and doesn't bury itself until the tach is around 2K rpm. That's normal operation.

What does your car do that's different than this?
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Old 03-08-2008, 12:02 PM
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that is wqhat it does exactly. So it is norm. That is cool. it does take some RPM on a hot one to get it burried. Is there a way to make sure it is properly working without dismantling stuff?
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Timothy Evans
TimEvans35@gmail.com
CELL 310 990 6780


1985 380 SL
2010 CL 6.3 AMG
*2009 CL 550 Sport 4matic
New addition-1984 380 SE
Newest Edition 1986 300E AMG
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  #4  
Old 03-08-2008, 12:23 PM
88Black560SL
 
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Originally Posted by Tims450SL View Post
that is wqhat it does exactly. So it is norm. That is cool. it does take some RPM on a hot one to get it burried. Is there a way to make sure it is properly working without dismantling stuff?
It's fine.

John Roncallo
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  #5  
Old 03-08-2008, 03:56 PM
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Originally Posted by Tims450SL View Post
I remember that Oil Pressure guage should be burried at the max while running. Is there a reason if I am losing pressure? Is it the Oil pump? Is that a common failure? Please help. I am like what do I do???
1 bar is good at idle. If you have 0 bar that is a different story.

The reason you lose pressure is heat. The oil thins and will bypass bearings etc... easier thus there is less back pressure built up.

If you never get 3 bar then you have a problem.

What to do is relax this is normal.

You will see even lower numbers in August when your temp gauge will go higher. I guess I could have save this one for the summer when everyone asks why is my car running at 100c. But I see you joined us last month. Welcome aboard.
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  #6  
Old 03-08-2008, 06:37 PM
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Originally Posted by Tims450SL View Post
that is wqhat it does exactly. So it is norm. That is cool. it does take some RPM on a hot one to get it burried. Is there a way to make sure it is properly working without dismantling stuff?
Just keep an eye on the oil gauge and check the oil level frequently until you get a feel for how the car does.

When I first got my car it had a pretty bad oil leak, and I had to add a quart every month or so. It had been sitting idle for most of the last 4 years. As I've driven it, the seals have sealed back up and it doesn't drip anything any more. If I go on a long drive (500 miles) I usually have to add some oil when I get back, but there's no smoke and it passes emissions so I don't worry about it. One day it won't and I'll have to refresh the valve seals. Till then I just enjoy driving it.
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  #7  
Old 03-08-2008, 10:59 PM
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Quote:
Originally Posted by Tims450SL View Post
I have noticed that my 75 450 SL loses oil pressure while running or the guage is messed up. Car runs alittle roungh when I do notice this. I remember that Oil Pressure guage should be burried at the max while running. Is there a reason if I am losing pressure? Is it the Oil pump? Is that a common failure? Please help. I am like what do I do???
It sounds normal, but why are you asking now? Has something changed since you got your car? Or are you just noticing now that you have an oil pressure gauge?
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  #8  
Old 03-09-2008, 03:38 PM
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I just noticed it one day and then started watching it...of course I know there is a Oil Pressure gauge...
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Timothy Evans
TimEvans35@gmail.com
CELL 310 990 6780


1985 380 SL
2010 CL 6.3 AMG
*2009 CL 550 Sport 4matic
New addition-1984 380 SE
Newest Edition 1986 300E AMG
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  #9  
Old 03-09-2008, 08:44 PM
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Originally Posted by Tims450SL View Post
I just noticed it one day and then started watching it...of course I know there is a Oil Pressure gauge...
Nobby has stress lately, so take my word for it that he's really a nice guy and he knows these cars inside and out.
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  #10  
Old 03-09-2008, 11:01 PM
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Originally Posted by ScottinSoCal View Post
Nobby has stress lately, so take my word for it that he's really a nice guy and he knows these cars inside and out.
Thanks for the character reference, you are too kind.
Sorry, if the question seemed snotty. I was being serious, though. I was just curious to know why the dramatic thread title was used when all along the gauge has been operating normally.
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  #11  
Old 03-10-2008, 12:38 AM
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sorry cause I was freaked out-I didnt; reply to seem indifferent to you- I have years invested in these 450's it is just that I was like OMG not a engine rebuild. I am like if i can tell there is a slight miss it irritates me...I appreciate your help- I really do. I did not mean to sound like a smart A-- Everyones help is always taken in confidence and respect. Scott has been extremely helpful to me.

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Timothy Evans
TimEvans35@gmail.com
CELL 310 990 6780


1985 380 SL
2010 CL 6.3 AMG
*2009 CL 550 Sport 4matic
New addition-1984 380 SE
Newest Edition 1986 300E AMG
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