Rooster71
NAXJA Forum User
- Location
- NEW MEXICO
I have a 1997 with the 4.0. It has 196000 miles on it. I am using 10w30 synthetic oil.
When I first start it, the oil pressure is about 50 psi. When I start driving, it is about 45 psi. After about 15 minutes, it will drop to 20 psi and fluctuate between 15 and 30 psi.This is at about 1900 rpm (65 mph). If I drop to 55 mph, it will go up to 40 psi. At idle, it is 35 to 40 psi. At the higher rpm's, it will do the 15 to 30 psi fluctuating. But, it doesn't do this every time I drive it. Other times it will stay at 35 to 40 psi. I did a search on here, but I did not find anything like this. I did see some posts about the oil pressure range, and my pressures are within the range. I just wonder why the pressures drop and fluctuate at higher rpm's some times. Anyone have any ideas?
When I first start it, the oil pressure is about 50 psi. When I start driving, it is about 45 psi. After about 15 minutes, it will drop to 20 psi and fluctuate between 15 and 30 psi.This is at about 1900 rpm (65 mph). If I drop to 55 mph, it will go up to 40 psi. At idle, it is 35 to 40 psi. At the higher rpm's, it will do the 15 to 30 psi fluctuating. But, it doesn't do this every time I drive it. Other times it will stay at 35 to 40 psi. I did a search on here, but I did not find anything like this. I did see some posts about the oil pressure range, and my pressures are within the range. I just wonder why the pressures drop and fluctuate at higher rpm's some times. Anyone have any ideas?