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Could be tensioners cracking, or one maybe loose. Better do more research and get someones head under the hood!
It's most likely the hydraulic lifters. Over time the oil leaves deposits on lifter surfaces and it make them gummy. Sinthetic, mineral and additive oils will all do it. Short runs don't help either. Warm the oil, drain it, fill with flushing oil. Run it as per the flushing oil instructions, drain it, change the oil filter, refill with a quality oil that won't emulsify on short runs, and change it at regular intervals.
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