I own a 2011 Chevrolet Silverado 5.3 Flex. Have low oil pressure still. First I tried a filter then sensor so I thought maybe the fill tube oring was bad while in there I replaced the oil pump. Started up just fine took for a test drive not even a mile low oil pressure popped back up. Need help any ideas?

Shouldn't be related just thought I'd add it in. The torque converter is leaking badly and the transmission needs an overhaul slips and everything.

 

Might want to put a mechanical oil pressure gauge on it to confer that the oil pressure is indeed low.

 

Is there a spot to put it other than the sensor and pump?

 

Usually goes where the sensor is located.

 

Ok I was finally able to work on it. I rigged it up so I can have both the sensor and a manual oil gauge hooked up and they both read the same thing. Both gauges dropped to 0. So there is definitely something wrong with the engine.

I have perfect oil pressure till it warms up then just keeps dropping. So it takes almost 10 minutes till it gets there. Should I just add thicker oil? When it reaches 0 it doesn't make any weird noises. I've had engines in the past do this but they usually sounded like they were about to blow up.

 

No don't add thicker motor oil. You have a mechanical problem that needs to be repaired properly. If your engine was not getting any oil, you'd know, as you'd have lots of noise from everywhere. I'm just hoping your bearings are getting oil. Edit: I found a link that might help you out:

https://www.mightyautoparts.com/onth...-oil-pressure/