thanks for the replies.

What is piston slap and how bad is it???


the oil is a 10w30. It sounds like its coming from the bottom, but the knock is more of a "tink...tink...tink". It doesn't happen on every stroke, but probably once per second only at Idle. Which if my math is correct is only about 1 per 12rpms (Idle at 700rpm). And like I said, as soon as I idle it up a bit, it goes away.

Any other thoughts?