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well I went to harbor freight, but an oil test kit and hooked it up to the port behind the oil filter. it shows 50 psi on start up. I didn't hear any noises since and my engine is ok. I am driving it just fine.
I also did NOT change the oil switch/sensor. I think what happened was the fast acceleration on this old 2003 X5 with 133k miles is not good, it took all the oil away from the bottom pan and it registered something bad on the sensor in my opinion. I said this is my opinion. don't ring my ears if I am wrong. I just can't be sure why it occurred.
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