993 Sudden drop in oil pressure reading

[Midwestredroger]

A few weeks ago ater the previous time when I had my 1995 993 out on the road I had topped off the oil level
with Mobil 0W-40 so that the oil gauge read 9 o'clock and full on the dip stick. The next
time I took the car out, after about 15 minutes of driving in local traffic the oil warning light
came on and the oil pressure gage dropped to about 1 barr at idle. The warning light went
off when accerating (and has not come on since) but the gage reading only reached
(when moving) to about 2.5 barr at about 2-3000 RPM on my way stright home. This car
up to this point has always had oil pressures of about 3 barr at idle and 4-5 when
anywheres over 2500 RPM and the oil waring light had never come on. Is this a sign of a
failure of the oil pressure sending unit or could it be a catastrophic failure of the oil
pump?. There are no oil leaks and the engine is dry.

[MDamen]

The oil pressure sending unit on the 993 does not have a long life. The failure usually shows as erratic readings, often going to one or the other extreme of the gauge. When mine was failing, I never saw a low pressure light, so your problem might not be the gauge.

[john walker's workshop]

Try 15/50 Mobil One like most folks use.

[midnight911]

+1 on senders. they break. mine's a third one.