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2011 Hyundai Santa Fe - Ticks in time

2011 hyundai santa fe ticking in time with rpm. Sounds like one cylinder, not all. Been doing this for a few months. Mileage 156,000.

the very first thing coming to my mind would be valve lash getting out of adjustment or if engine has hydraulic valve lifters - the lifter getting stuck either from age or from oil contaminants

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First thing I’d suggest is to check the oil. When was it last changed? How often?