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#1
06-12-2023, 09:57 AM
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1985 300SD Oil Pressure
I've had this car for about a year and, as long as I've had it, when it starts up the oil pressure gauge reads 2 bar. As soon as I hit the accelerator, it would jump to 3 bar. Yesterday, on the drive home from work, I noticed it was sitting at about 2 bar while accelerating (not WOT, just light acceleration). At idle, it would stop to about 0.1 or 0.2 bar, and it wouldn't reach 3 bar until I was at about 2,300 RPM.
I haven't had a chance to do any troubleshooting since, right when this happened, I had to leave on a work trip the next day and just returned. I haven't even checked the oil level yet. I've read around the forum and see a lot of people recommending the 2 small o-rings in the oil filter housing. A couple of others recommending the sending unit itself. The only thing that caught my attention was, everyone that was having the o-rings recommended had recently dinner an oil change or some other maintenance involving the oil system. I haven't touched it since the last oil change about 6 months ago. I was just hoping for any sort of insight. Thank you for any help 
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#2
06-12-2023, 12:34 PM
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First, open the hood amped make sure your oil cooler hoses are intact. If the ps belt is in contact with them, replace your motor mounts, and hoses…
Next, change the oil and filter, and make sure you replace the o rings. If it doesn’t improve, it may be wiring, grounds, etc.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 560SL convertible 1987 190D 2.5-5SPEED!!!  1987 300TD 2005 Dodge Sprinter 2500 158"WB 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#3
06-12-2023, 09:38 PM
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Subscribed to find out what happens .
The OM617 oil filter O-Rings are 6 & 7 MM, be sure they're Viton or other DIESEL rated as they'll disintegrate rapidly if not . I can't see this causing your low reading, as mentioned test the gauge first by grounding the lead to the engine block and see what it reads apart from the engine's internal pressure .
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-Nate 1982 240D 408,XXX miles Ignorance is the mother of suspicion and fear is the father I did then what I knew how to do ~ now that I know better I do better
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#4
06-13-2023, 06:18 AM
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Could be a faulty pressure sender as well.
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RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K 90 Dodge D250 5.9 Cummins/5 speed. 400K Gone and still missed...1982 w123 300D, 1991 w124 300D
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#5
06-13-2023, 07:05 PM
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Don"t know if URO oil senders has been fixed but bought two and both leaked after a
few days,live in the country always parked off the lawn, lucky I noticed oil on some leaves. Leak out over a quart in a few days with low miles.
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