Thanks for the update.
Still confusing as to what the fault is but at least the warning lamp is now off.
Another area to consider for noise is the crankshaft pulley as this can create very odd noises and is diagnosed by removing the auxiliary drivebelt which runs the alternator, etc. If the belt is removed and the noise disappears then this is the issue.
Check the battery is fully charged and delivering the power the system needs to operate.
Also, if it has discharged in the past (e.g. during lockdown) then the battery charge may need resetting via a scan tool for the vehicle to know the new voltage (e.g. post lockdown)
I would probably recommend a heavier grade of oil (10w40) as it has done the high mileage.
The thinner viscosity can result in blow-by in the cylinders if there is excessive wear which can result in burning oil.
Also, the thicker oil will be fine it the engine is allowed to get hot enough to burn off carbon within the engine, if it is being used locally then maybe stick with the 10w30.