Yeah...it's a cold idle. Every car does it, perfectly normal.
Cba to write my own explanation, so I'll copy and paste a good one:
"It's not actually to warm up the engine for the oil, it has to do with combustion. The requirements are fuel (gasoline), air, and a spark - all under pressure in a precise ratio and timing. This process happens ideally at warmer temperatures (the "operating" temperature) as this is where the fuel vaporizes naturally.
When it's cold, combustion requires much more fuel in the ratio because it does not sufficiently vaporize from liquid gasoline into a gaseous form (liquid gasoline, for the sake of this discussion, does not burn). The problem is, too much fuel through the engine at a low speed bogs down the engine as the unburned liquid fuel will kill the spark and cause it to stall. The RPMs are bumped up to push this fuel out more quickly until a more desirable temperature is attained. Once warm enough, the fuel vaporizes as it should, the computer dials back the fuel mixture (or the carburetor opens the choke) and the RPMs can come down."
