If you got the light without the buzzer at highway speeds, then look for a shorted wire to the low pressure sensor. if the high sensor was disabled and you got a true warning from the low pressure switch, then you got a real problem. .3 bar = ~4 psi. Normal oil pressure should be close 10 psi/1,000 rpm. Thicker oil will not help that much.

Dennis

----- Original Message -----
From: Jeff Lincoln <magikvw@GMAIL.COM>
Date: Tuesday, August 8, 2006 12:09 pm
Subject: Re: Oil Light

> Thank you all. The light is blinking while moving/and at idle. The
> firsttime I was running at approx 55 and had been running for
> about 15-20 min.
> The second time was at much lower city speed and a lot of stop and go.
>
> I just changed the oil and I put 15w 40 in it. So maybe I need a
> higherweight oil. I'm not sure what type of filter I put on. I
> asked for a Bosch
> but they were out so I took what was there at Auto Zone.
>
> It is possible that the oil level is a bit low as well. So I'll
> check that
> after work.
>
> I appreciate all the responses - From what you have all said I
> should be OK
> - just go to a higher weight oil - double check the level and keep
> an eye on
> it. I don't see any leaks and the buzzer Dennis mentioned didn't
> go off (if
> it works). If my conclusion sounds wrong please let me know.
>
>
> On 8/8/06, dhaynes@optonline.net <dhaynes@optonline.net> wrote:
> >
> > 86 and later has what is known as the "Dynamic" oil pressure warning
> > system.
> > The dynamic is that it has two sensors, with each being checked
> depending> on engine RPM.
> > The low pressure, (.3 bar) sensor is located between the push
> rod tubes on
> > the drivers side of the engine. It is normally closed,
> completing the
> > circuit to ground until sufficient oil pressure causes it to
> open. When it
> > is closed, the oil pressure warning light will flash.
> > The higher pressure switch, (.9 bar), is located directly off
> the oil
> > pump, found under the water pump. It is reverse acting, that is
> it is
> > normally open, closing or completing the circuit when the oil
> pressure> satisfies it. This is sort of a fail safe since a broken
> wire or bad
> > connection will keep the circuit in warning. This switch is
> monitored when
> > the engine RPM is above 2,500. In warning, you will get both the
> blinking> light and a buzzer. Once the buzzer sounds, it will
> continue until the
> > circuit is closed, (satisfied) or the ignition is turned off.
> >
> > You don't say what the conditions are with your blinking light. An
> > occasional blink at idle after a hard run indicates a bad switch
> or low oil
> > pressure issue. Intermittent while running could be a bad switch
> or shorted
> > wire. If you have low oil pressure, I would suspect the high
> pressure> warning will also sound unless someone attached the
> sensor wire to ground.
> > Seen that many a time.  I've even seen the oil pressure warning
> board> removed to silence things.
> >
> > What viscosity oil are you using? 20w-50 or something close to
> it is
> > needed. This will have an effect on oil pressure. Also, the oil
> level is
> > extremely important. You want the level between the marks. The
> upper mark is
> > not the full mark. It is the maximum do not ever exceed no
> matter what mark.
> > This is extremely critical during high speed, high load operation.
> >
> > Hope this helps.
> >
> > Dennis
> >
> > ----- Original Message -----
> > From: Jeff Lincoln <magikvw@GMAIL.COM>
> > Date: Tuesday, August 8, 2006 10:13 am
> > Subject: Oil Light
> >
> > > Just a quick question. I've got the 86' running (and stopping) and
> > > have put
> > > about 200 miles on it locally. Anyhow, today the oil light started
> > > blinkingfor about 2 minutes and then stopped. It did this a few
> > > times. My previous
> > > bus was an 85' and that oil light never blinked it would just come
> > > on steady
> > > when there was an issue. So what does the blinking mean exactly?
> > > Thank you
> > > for any replies and sorry for the elementary question.
> > >
> > > --
> > > Thanks,
> > >
> > > Jeff
> > >
> >
>
>
>
> --
> Thanks,
>
> Jeff
>