Well, I had the intake off of the ‘95 E300 today. I replaced some metal fuel lines and bypass hoses. I installed a new valve cover gasket. Put everything back together and there’s NO oil pressure. It will barely rise when accelerated. Sender is still plugged in. What could I have goofed? I guess I’ll be retracing my steps tomorrow morning. Ugh!!!

I left the car sitting for about an hour. Went back out to crank it and the oil pressure popped up to 3 on the gauge. It ran for about 3 minutes then dropped back to 0 on the gauge. Reckon something is getting stuck in the sending unit orifice intermittently? I’m gonna change the oil and filter first thing in the morning and see if that helps.

That's pretty well how my sender failed. Just one day, 0 oil pressure. It would sort of rise up to "1" or so on occasion, but otherwise nothing. Open the oil fill cap and see if you have oil flinging off the camshaft. If you do, there's oil pressure to get up that far and probably the sender or the wiring that's the issue.

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Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)

Black Sheep:
1985 524TD 167K (TotalDumpster™)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

I’m hoping it’s that simple. I have a few senders lying around.

Great advice by Diseasel.

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1998 Ford Escort ZX2 5 speed - 279,000 miles My Daily

1992 Mercedes 300D 2.5 202,000 - Pure junk
2000 Mercedes E320 Black - 136,000 miles - Needs repair

Don't forget to grease the screw and threads on the spring compressor.

Only thing I can add to this is be sure to disconnect your battery before changing the sensor. The main battery connection to the starter is right below where you will be working.

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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech

Aside from the sender going bad, which is fairly common(on my 94 e320 as well, working intermittently): the wiring harness(separate that includes the starter signal wire as well) is biodegradable and can short or lose continuity

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97 e300d, 78 300Dt, 95 E300d, 94 E320 estate

The wiring harness has been upgraded.

Don't bother changing the oil, it won't help as you could be running water with a clogged oil filter and still have pressure. ( the filter system has a bypass )

Since you have a few sensors, change it and see what happens.

It’s actually due an oil change. It’s gonna get a change AND a sender.

There's a good chance it's in the wiring connector at the sender. After a couple hundred thousand miles I had to rework the wire on several senders. I suppose the heat and vibration takes it's toll.

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84 300SD
85 380SE
83 528e
95 318ic

I will check that Clemson88. On another note, are you in Pickens County?