Join Date: Oct 2012
Location: New Zealand
Drives: Kia-Rio EX 1.4 Hatch Petrol (Silver)
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The dealer would know what the problem is; they just don't want dismantle the top of the engine to adjust the valve lifters. It's quite common to have a momentary ticking from a new engine at start-up, but it should have settled by 2000km.
Oil grade recommendation is probably 5W-20 and I wouldn't change it just to get rid of a slight noise. Keep pestering the dealer to have it fixed if it worries you. Some oils (e.g. Castrol Magnatec) are supposed to be good for cold starts. Might be worth a try if you can get the correct grade for your car.
Assuming it's a valve-lifter noise, on some engines (particularly older cars), there's an adjusting screw to regulate the clearance. It's an easy job, and you can isolate noisy "tappets" prior to adjustment by (temporarily) inserting brass shim.
Other cars have cam followers than need to be adjusted by adding/removing (permanent) shims; this requires removing the camshafts.
Not sure what your car has, but it's likely that it needs more than a simple adjustment.
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