190-195F is definately not too hot. I have never had an oil temp gauge,
but I know oil is usually closer to 250 than 200. Synthetic can take
more heat without breaking down than conventional, a lot more. I just
swiped this off a web site talking about oil temps. Hope it helps. It is
for air cooled VW engines BTW...
* What is a "correct" temperature?
180 F: too cool; is the thermostat still there?
180-210: peachy.
210-250: can live with it; many busses w/ type4 engines get that hot under load in
the summer.
250-280: something is wrong and must be fixed; however, viscosity of good synthetic
oil should still be fine. If it's after dark
and I'm in East St. Louis, I keep on driving.
280 F: better stop; unless the oil pressure light is on (in which case you must shut
the engine off immediately!), let the
engine run. Glen Buhlman recommends that it not be left idling, but that revving it
will allow the fan to do a better job of
cooling the engine.
Fabricated Advanced Bldgs 2 wrote:
>
> How do you tell if your oil temperature is too hot? I have a 2.5L NA
> diesel and the temp gauge reads just below red after about 20 min of
> steady driving. So far it does not move into the red, but the ambient
> temp is still relatively low here in CA. The water temp gauge moves
> to the midpoint and stops. The engine has an oil cooler that seems to
> be functioning (the cooler/lines get hot tho the touch when the oil
> thermostat opens). I've tested the thermostat for the oil cooler and
> it opens at about 170F. Voltage output at the gauge is about 6.3-6.4V
> and the same at the temp sender. If I run the truck until the gauge
> reads just below the red, stop, pull the oil filter off and stick a
> digital temp gauge in the remaining oil in the filter it reads about
> 190-195F. The truck runs great, does not excessively burn oil, and
> does not seem to be running hot. Any suggestions would be much
> appreciated.
>
> Matt
> Ex-MOD 2.5L Diesel 90
> 1999 Disco SI
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