Originally Posted by DrivingMissDD
Sounds like a case of major case of piston slap....
Huh DD?
Case of beer maybe....lol
Is the knocking noise down low or towards the top?
What is the oil pressure? > hot?
Usually a rod or bearing noise will get worse when hot.
They way you described it, it kinda sounds like a lifter taking it's sweet time priming up.
A piston slap will sound similar, after a few minutes of driving they'll heat up and expand which quietens them down, either problem is no biggie, drive it till the wheels fall off I say.
What type of oil filter you using?
El~ cheapo filters like a "FRAM" the anti drain back valve never works, try a wix, napa brand or purolater.
The 'good' filters will hold some residual pressure and stay full after you shut the motor off - when you start it up (cold) the motor wont do all that klinking and clattering till the oil pressure builds up.
Something to think about.
Goodluck, Cp