Hi Guys,
Changed the oil a few days ago for the first time, Mobil 1 5-30 and while checking for any leaks I could here some noise from the lower end of the motor. I'm not sure what oil was in it previous but I think the Ford 5-20. I bought it with 10k from a Ford dealer and it now has 13k on it. The noise goes away after the motor
begins to warm. Anyone notice this, is it normal????
Sounds somewhat like a diesel, loud enough just to be noticable.
If I turn off the motor and let it sit for 20min +/- the noise will return and fade away after ran for while.

Thanks

 

Bearing knock or piston slap?

 

It's normal. I've used Mobil 1 since the first change, every 3k since and I now have 84k . I have the same noise every morning at start up.

 

Does it go away after the motor is warm

 

My 2001 has done it since new, its normal for 5.4's and wont hurt a thing.

 

Normal! I agree....but, irritating nonetheless!

 

It's normal. Happened after my 3rd or so oil change.