Re: Oil pressure drop, but oil level fine...

[John Graham <jgraham1@erols.com>]

Gerard wrote:

> Hi!
>
> Some of you might know that I recently changed over to synthetic oil,
> I'm now using 5W40. Yesterday it was about 35 celcius here, also
> humid and I headed off to do some shopping after work. I then noticed
> my oil pressure gauge drop to around 1 bar at idle. It has been doing
> this since yesterday. I also just had the sump gasket and turbo oil
> feed line replaced. Now I see something is leaking oil again, not
> a massive leak, but still a leak. However, this morning there were
> no oil drops under the car. Pressure is at 4 bar at startup, but once
> it heats up to about 90 celcius on the dial (or just below that) then
> the oil pressure will drop below 1.8 bar and as low as 1.0 bar. The
> vehicles manual (this is a 200T, 1990 model) says to stop the
> car immediately if the pressure drops to below 1.8 bar. Odd thing is
> that it seems that new synthetic oil is living up to its name 'cos
> the car definitely has more power and drivability compared to what it
> was before the oil change.
>

My Audi is a 20V Coupe non turbo and it's pressure is about the same 1.3
to 1.8 barwith Synthetic 10W40.

> But even though more drivable and smoother on the power now I am very
> worried about this low pressure reading. I have checked the oil level
> and it is perfect. The oil loss at the sump or wherever is negligable.
> Does anyone  have ideas of where I need to look and what to check on
> this 200T to narrow down where the problem might be? I'm already
> starting to think that something gave somewhere or the pump is loosing
> pressure somehow. Could it just be the viscocity of the oil?

Do you know what it was before the oil change?  And are you useing an OEM
oil filter?There may be more back pressure on some non OEM oil filters.
And doe's the oil light come on at any time?
And another thought. There may be nothing wrong. It may just be the
viscocity.
What the manual say about viscocity?


>
>
> G.
> --
> "a thousand miles from here, there is another person smiling"
> name   : gerard van vught
> tel    : +27-57-912 2658 (w) / 082 923 9609 (cell)
> url    : http://www.acenet.co.za/homepages/gerard/
> e-mail : gerard@poboxes.com  / han.solo@galaxycorp.com
>          gerard@acenet.co.za / van_vught@frg.issi.co.za

  John.
1990 CQ