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Yesterday, as I do most weeks during winter aly-up, I started the 550 up...It started 1st time as usual went through it's engine check routine, Said "OK"...

But once warmed thro' for about 15 minutes I took it around the block, and noticed the Oil Pressure gauge moving in sync with the revs as I pressed the accelerator....at 3,500 rpm it was mid point on the gauge were it normally stays, but at 5,000 rpm it was approaching 140 lbs/In, So I limped home....Does anyone have a diagnosis?:confused:

I checked the Oil resvoir, It was on Max.

Argento
 

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Where does it normaly sit at idle ?

The more revs, usualy oil pressure goes up.....


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What year is your 550 ? Early 550's are know to develop oil pressure problems. It is fixed by adding a few spacers to the line.

I would try to run the car again today to see if the problem re-emerges. It might just be a tempermental gauge that sat in the cold for too long.
My 550 is 1999, when idle the pressure is 35, but on higher RPM the oil pressure gets to #110 PSI. it should be # 80 PSI. Where you add the spacers, which line. thanks.
 

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Discussion Starter #5
What year is your 550 ? Early 550's are know to develop oil pressure problems. It is fixed by adding a few spacers to the line.

I would try to run the car again today to see if the problem re-emerges. It might just be a tempermental gauge that sat in the cold for too long.
Hey Box,

It's a 2000, I'll try it again tomorrow and let you know, Maybe it's always been that way, I've just never noticed before?
Garage is heated and de-humidfied so conditions are pretty much the same all year round.

Argento
 

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My 550 is 1999, when idle the pressure is 35, but on higher RPM the oil pressure gets to #110 PSI. it should be # 80 PSI. Where you add the spacers, which line. thanks.
Either your local official dealer or any good independent specialist should be able to do it for you. Also I believe the spacers need to be removed, not added.
 

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I used to have this exact same problem on my 2001 550.

It turned out to be a defective oil sender unit, once replaced, everything was fine. One of the cheaper fixes, and I have heard of them going wonky before...you might want to try a new one and see.
 
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