I recently had my oil changed in my car. They put in 5w30. Then I noticed my car making a noise from the motor. I had it looked at and they told me that my oil pressure was bottoming out. So I took that oil out of the car and put in Lucas Oil Stabalizer 1 quart and 4-5 quarts of Valvoline 10w30. The car is still making the noise. Does anybody now what I should do to fix it? The noise does not happen all the time.