[Bmb]

I just got a Jeep. I needed to change the radiator so I done that. But before I done this i checked my oil level just because I thought I might as well since I was there, saw that I needed some so I kept that in mind. So I just got done installing new radiator and filling with new coolant. Took for a test drive and noticed the oil was fluctuating, goes up to normal when stepping on gas, goes down to first tick when idling. Not sure right now if it is because of low oil or if I done something wrong with coolant. Before I done all this the pressure gauge read normal. Not sure if this is normal.

 

[warriorsuspension]

Welcome to the forum

That is typical with an engine with some miles on it

 

[InfernalRed]

The oil pressure switches get all gummed up after time. Replacing that should give you a more accurate reading.

 

[Mikeysjeep]

I would hook up a temporary manual Guage to the electric sender port. You’ll get a more accurate reading.
My XJ has 188000 so l’m using 15/40 motor oil it has zink in it, witch I believe helps with the high milage engines.

 

[InfernalRed]

I had a rebuilt engine put in few years ago. In order to avoid voiding the warranty, I was told to only use Rotella T4 Conventional 15W-40 Diesel Engine Oil. Haven't had any issues with it.

 

[Mikeysjeep]

InfernalRed
Rotella 15/40 is my favorite go to oil on my older vehicles.

 

[Bmb]

Thx guys. I’ll try your suggestions if need be. I found that it was because I was a little low on oil.

 

[Mikeysjeep]

I would have thought you would have checked your oil level, before taking the time to set down and post on here!!