Folks, the oil debate was over two years ago. I just tagged on the oil pressure "sender" pic because I found it while cleaning up and before throwing it out I thought I'd post it, and because I'd first mentioned it at the end of that old thread, I put the pic there.

Let's not rehash the OCI, it's all been said before.

 

I had the same problem a few weeks back and began planning to evaluate a new oil pump, or just rebuild the engine. I decided to take the "bad sending unit or gage" approach change those out first. I started with the sending unit and discovered the plug was covered with oil and dirt. I probably could have just cleaned the plug and connector to the existing sending unit. But I decided since I already had the cover off in the passenger compartment and a new sending unit in my hand, and with 201K miles on the old one, I'd just change the thing anyway. I now get good oil pressure --between O & R of NORMAL, mostly towards "R".

Prepare to lose some knuckle meat and possibly bleed a little. The oil pressure sending unit is in a tight spot (top right rear of engine on passenger side, just below the distributor) and several sharp parts nearby. Also, don't confuse this oil pressure sending unit with the "low oil level sending unit" mounted in the oil pan on thie side. This one lights up the "Low Oil" light, not the analog or digital oil pressure gage.

Recommend you also consider changing the distributor cap and rotor while you are back there. It might even give you a little more room to work with the oil pressure sending unit if you remove the distributor first.

Good luck,
Michael
'93 Aero 3.0L
'94 Aero 4.0L

 

Changing you oil at 3,000 miles is for severe duty. The conditions that qualify as severe duty are outlined in your owners manual. 7,500 is good for all other uses, assuming the engine was properly broken in to ensure the oil is not getting contaminated with blowby.

 

Michael,

Which engine was that? I think on my 4.0L, the oil pressure switch is on the front left side of the enigne, behind the power steering pump. It would require removal of the AC compressor and PS pump to get at.