Oil Pressure dropping Toyota 1HZ

Submitted: Monday, Mar 01, 2010 at 23:46
ThreadID: 76470 Views:11670 Replies:7 FollowUps:8
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G'day,
I have a 94 Troop Carrier with a 1HZ. Its has done 415,000k's. I have done about 40,000 in it. Recently the oil pressure gauge keeps going up and down, today it was hanging around the lower central mark on the gauge at 2500rpm's, at lower revs it would pick up. I regularly change the oil & filter, around every 5000, last 2 changes I've used Castrol 15W 40 diesel oil. The temperature is consistently in the middle, never moves. Does anyone have any ideas why the pressure may be dropping?
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