I used to hear this in about every car I have owned; the oil cushion isn't there for the first few seconds allowing a little more clearance than is present after the oil pressure is where it belongs.
As an experiment many years ago, I started using a molybdenum disulphide additive and have not ever heard it in another vehicle after adding the moly.

In some cars, it will actually improve fuel economy and power, - slightly.
For certain, it improves durability as even in small, high revving 4 bangers, it can extend the life of bearings and rings by (I'm not joking) by 50-60%.

I don't sell it, own no stock in any company marketing the stuff but have had a lifetime supply of the dry powder for 20+ years and have put some form of it in every crankcase of every car I have owned since 1968, adding a tablespoon with each oil change.
It has characteristics that no other additive can claim and the German military uses it as a matter of course.

One test I have read involved a high-mileage Ford V8 that had a commerically available moly additive added to the oil, driven for a under an hour to mix and circulate it through the engine.
The crankcase was then drained of all oil and the car was driven at speed around a track for over 100 miles before the engine finally seized.