My '95 2.5L with 116K on it started leaking oil about a month after I did myself a favor and replaced the oil sending unit with a NAPA aftermarket one. Before that, the original Mopar one was showing 75-80 lbs all the time! The Napa one worked fine, showing a normal 35-45 lbs. I thought the oil was coming from the filter or dipstick area, but careful tracing it back showed that it was coming from the top of the sending unit! It turns out that the aftermarket one for the 2.5L's single wire unit uses the same plastic housing as the 2-wire versions for other vehicles, they simply plug the un-used contact hole with what looked like a wad of silicone, not even a hard epoxy! After a few thousand miles, the plug blew out, causing the leak! After staining two driveways and scaring me into thinking I blew out the rear seal, I angrily took it back to Napa and got a refund ($24) and went to a Jeep dealer and paid $31 for a genuine Mopar unit with, sure enough, only a single contact pin and no plugged hole. So, word of caution, use geniune parts for small stuff like this. Now I have no more leak! BTW, my rear temperature sending unit decayed from age and the wire fell out, but I replaced it with a Mopar one for $16, well worth it. Who knows what the aftermarket one was made like......
