I have this problem and it started like yours, with an erratic oil preasure on the gauge; it finally gave away and has been pegged at MAX for the last 15,000 miles. I do not believe it's the filter as I have used OEM and non OEM. I've not gotten around to trobleshooting it and I am leaning towards the oil preasure sending sensor to have failed. The SM has a guide to check for this. Does your oil light on the dash come on when you open the key? The other possible problem and probably the most expensive to fix will be the combination meter as stated in the SM.pawjr74 wrote:I noticed today that when accelerating the oil pressure gauge is maxed out at the top of the spectrum. Under normal driving and idling it's normal. The only thing I can think of is that I used a Fram Tough Guard oil filter. (I always use a Nissan filter) Has anyone else run into this?