OK .... I've had a look at this now .... basically having to re-familiarize myself with both the manual and operation/s of these simulations in the process.
In so far as I understand your posting
.... I'm not seeing anything, at all, of any concern or that may be considered out of the ordinary. In fact the only thing that concerns me is I can't seem replicate/identify what you're doing that's resulting in the indication/s you're quoting/observing.
I can therefore only advise as follows ....
Using the DC-10-30's (in fact each of the GE CF6-6 powered DC-10-10's and GE CF6-50 powered DC-10-15/-30 versions also) .... and with all 3 engines started and running at ground idle (minimum running speed with the APU "OFF") the Oil indications on the FE sub panel read (approximately) as follows ....
OIL PRESSURE = 48.7 PSI
OIL TEMP = 106*C
OIL QUANTITY = 14 quarts (for the P&W JT9D powered DC-10 40 versions this's measured in gallons = 9 gallons)
There may be a little variation in the Oil Pressure and Oil Temp indications for the DC-10-40's (but not by much .... if at all) simply because the P&W JT9D engines are different from the GE engines which power the -10 through -30 DC-10 versions.
As power is advanced the Oil Pressure indications are seen to "increase" slightly ..... to around the early to mid 50's.
These particular indications can then be seen to vary slightly during taxiing, TO, climb, and cruise .... depending on the power settings applied.
In fact the only time these Oil indications will drop/reduce is "after" engine shutdown and which results in the following observations ....
OIL PRESSURE = 0 PSI
OIL TEMP = 17*C (possibly further slowly reducing too)
OIL QUANTITY = 14 quarts
All this's all perfectly normal .... and I can only say these simulations, as they're currently programmed and supplied, are performing "normally/correctly" .... and as I've related within the manual.
Again .... I can't recreate the observations you're reporting and nor can I determine what you might be doing wrong to generate such indications.
A couple of details to perhaps bear in mind ....
Despite the considerable functionality/fidelity designed into these panels/simulations ..... "by default" these DC-10 simulations each load into FS with all systems (except the very basics) pre-configured and ready for departure.
At the same time these DC-10 simulations are also designed/compiled so those, whom wish to do so, may shutdown everything "manually" .... then .... "manually" activate each of the represented systems from a basically cold and dark scenario.
It's acknowledged one needs be "very familiar" with the "default" panel configuration first and foremost and in order to get the very best out of these simulations .... and it's recommended one also needs to be "equally (if not more-so) very familiar" with both the manual and all panel systems "before" attempting the manual panel configuration option/procedures.
Using the "manual" panel configuration option .... if a particular system isn't incorrectly set, or is inadvertently overlooked, then there's a very strong likelihood this'll cause something else/certain other panel features/systems to not work correctly or at all.
"IF" you've been using the "manual" panel configuration procedure, then, I can only "ASSUME" you've possibly not set up something correctly or have maybe missed, or misunderstood, a particular step in the checklist .... BUT .... on the basis of what you've, so far explained I can't identify what you've done wrong in your particular case.
Whilst a "very high degree of systems functionality/fidelity" has been compiled into these DC-10 panels/simulations .... not every system can be replicated (of course) .... simply because FS doesn't support a sufficient number of parameters to enable us to replicate more than has been represented .... not to mention there's also limits to our own understanding and abilities to program as well.
Most systems represented within these DC-10 panels/simulations won't fail .... as such .... simply because they'e not supported by any pre-programmed random failure mode, but, the like of manual engine startup procedures do require "precise panel configuration" or the the engines won't start at all.
Also .... and as I implied within my first reply ....
Short of an inadvertent panel/system misconfiguration .... an abnormal Oil Pressure indication (although such shouldn't ever happen .... provided everything's configured correctly) isn't going to trigger any failure/s within these DC-10 simulations .... beyond possibly illuminating anunciator lamp .... simply because this particular parameter hasn't been pre-programmed to fail.
What I'm saying here is .... these DC-10 simulations can't/won't fail in the (unlikely) event of an abnormal Oil indication. No uninstalling and reinstalling is going to resolve this. The (yet to be determined) cause of your abnormal Oil indication must therefore lie in the manner in which the recommended procedures are being interpreted/implemented
I regret I can't replicate your particular issue .... or identify anything in these simulations that requires any additional attention on our part.
So far as I can determine "everything", as is currently supplied by us, is operating normally and correctly.
Mark C
AKL/NZ