silviaz: Yup your best bet is to keep your oil clean. Mine started rattling soon after I bought it over a year ago and has been making racket for at least 15000 miles. Like SHIFT_control sez you probably won't have any major issues unless you're hearing the noise constantly.
My car's jacked up in the garage as we speak getting all new timing chain kit installed, and what a dirty PITA job that is.. Especially when you've had a PS leak for a year too
. The plastic guides were starting to show some wear from the chain slappin them, they had little ruts dug into the plastic... GL