Hi, I have an '06 Rio5 automatic hatch which has the same motor as the new
Accent (1.6 Alpha CVVT).

It has always had some piston noise when cold and I realise that's quite
normal but just recently I've noticed a piston noise (sounds like just 1
cylinder) even when hot.

This occurs at around 1700rpm under light load e.g. coming up a long,
slightly inclined driveway at about 15kmh. It's not pinging as I use
95RON.

I always drive the car with consideration and ran it in carefully. It's
due for its second oil change (15000ks) and I supply my own oil to the
dealer (Castrol Magnatec).

Is this condition more than just an irritation? Could it cause premature
engine problems? (out of warranty of course!).

Should I push this issue with the dealer before my warranty runs out?

Do you think a different type of oil may lessen the problem?

Like everyone else here, I appreciate your presence on these forums.

Thanks, Rick

Thanks Hyundaitech, it looks like it's time to don some armour, take a deep
breath and go into battle with the dealer.

In Australia, to most dealers, anything short of a con-rod through the
side of the block will always be called "normal"!

Thanks again, Rick