Oil Pressure Fluctuation

I take it that it is time for an oil and filter change then Bill.

What do you mean it fluctuates? The oil pressure will go up and down in step with the engine rpms which is normal. If that's not it, maybe you just have a defective oil pressure sender which is mounted just above the oil filter.

Jerry

Neil Currey wrote:

The oil pressure senders on the 4.0L's are notorious for failing. Hook up a mechanical gauge to the oil sender port to check if you have adequate pressure. Or just get a new sender (not the switch, that's for the non-gauge idiot light version) and install it, see if it helps...they aren't expensive.

How is it fluctuating? Does it jump down to 0 or up to Max? If it jumps up, the sender is shorting to ground. I had a 93 XJ with this problem, replaced the sender, no more jumpy gauge.

That's the recommended change interval, for most modern gasoline engine vehicles, for "normal" operating conditions. "Three months or 3,000 miles, whichever comes first" is not necessary unless you want to make oil companies rich. Also, people in the rest of the world pay a bit more for petroleum products than we do.

Now if you play in sand, like Bill does, or take frequent short trips in cold weather or race then you would want to consider a shorter change interval. And if you are considering going to 10,000 k, like the rest of the world does, then use high quality oil and a decent filter. I like a Mobil 1 filter, Valvoline 10W30 petroleum based oil, and oil changes once a year whether needed or not. (I have four vehicles and rarely get 10,000 k on any of them before an oil change.)

Earle

My gauge is doing just that . I will change it out when iI get the oil changed tomorrow .

Neil in NZ