Is this in all phases of flight?
This could be a cowling issue or baffles or even mixture.
We need a little more info.
How old is the airplane, how old is the wiring, the gauges, when did the engines get overhauled, is oil consumption equal etc etc etc.
In the big scheme of things, no, this doesn’t have to be a problem but it could.
Last edited by B2N2; 16th May 2021 at 21:14.