re: 89 200TQ Oil Guage

["scott miller" <macatawa@hotmail.com>]

My guage and multi-function display both told me my oil pressure was 
low, aren't they on separate sensors?  I bought this car last spring and 
was troubled with low oil pressure when hot idling, full scale pressure 
when cold.  After a couple changes of Mobil1 I tried adding Prolong.  
Not only did it reduce the knocking, it raised hot idle oil pressure 
just enough to quit setting off the low oil pressure alarm.  I didn't 
add prolong on the last change, the problem is back.

Scott
'90 200qw (~160k)
--------------------------------------------------------------------------------

Are we sure we don't have to worry?  My 89 100Q at startup pins the oil
pressure gage past 5 bar.  After 2-5 minutes it drops to what I consider
normal operation of 2 to 4 bar (dependent on RPM).  I have always
thought this was due to the oil warming and its viscosity lowered.
However, I found out two months ago (the hard way) that my 100Q has an
external oil cooler.  Bentley implies this is a feature reserved for the
turbo engine.  I definitely have one, as my oil cooler blew out and had
to be replaced.  Now I wonder if the initial high oil pressure "reading"
(key word, Selander) is a result of the oil cooler not opening until
after warm-up.  Any thoughts?


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