Low oil pressure after engine warms up. had the oil pump changed and does the same thing. Reads around 20 when ideling. I've had the vehicle about 3 months and its allways read 40 pounds, even when idleing. engine runs fine. Just started reading 20 the past week. I had a new oil pump put on, cost me 400 dollars since they had to pull the transmission off to get to oil pan. I like my old truck, is it safe to keep driving it.
I have a 99 blazer and ever since I have owned it, it reads lower in pressure when idling, but will go up too 40 while driving. This is normal for the vehicle. If the pressure gets real low, and stays low, it means its time for an oil change.
As long as the pressure goes up when you give it gas, it is fine.
Testimonial: "But why has it started reading low, especialy after the new oil pump was put on. It read a constant 40 even when idling before."
Should have 10 lbs of pressure for every 1000 rpm. was oil pressure sending switch replaced with oil pump? 40 lbs at idle is high for a stock pump, 20-30 at idle, 40-60 running is normal
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