The dealer doesn’t want to be bothered (of course, the service writer won’t actually say so).
Take your vehicle to an independent shop. Suggest they put an oil pressure gauge on it, rev the engine, and watch the oil pressure a few minuets. The ears (use, thereof, to detect sounds) will tell a mechanic if the hydraulic lifters are pumping up. The lifters get noisy when oil pressure/supply gets too low.