WD40 as wood stainer?

I found this antique door handle in the shed, probably left by the previous owner of this house. It looks about 100 years old. The front handle is made of casting steel / iron. It is linked to a metal bar, and the bar is suppose to go into a hole on the door, and at the other end, there is another handle which is connected to the metal bar with a grub screw - I was not sure if the back handle was metal or wood because it was very dusty. I presumed it was also metal because the front handle was definitely metal. When applied with generous dose of WD40, and cleaned up, the back handle appeared its wood grain what looks like oak. It is now covered in WD40, and I had to clean it up with a rag.

I was wondering if WD40 can work as wood stainer, because the wooden handle cleaned up nicely and came up with the good oak grain as if linseed oil was rubbed around. It is now serving as the shed door handle.

WD 40 is mostly Naphtha and Hydrotreated mineral oil.

So yes it could be used as a wood treatment - some Danish oils contain mineral oil

the difference is WD40 will leave the wood oily whereas the Danish oil has drying agents.

The petroleum based propellant will have removed the grime but the stain effect is temporary, needs Danish oil or similar as suggested.

Yup, I am going to apply a second coat with old unused engine oil. The engine oil is about 10 years old, unused in the original can. Should be OK for the 2nd coat of wood staining on the shed door handle, I guess.
Will apply on some parts of the shed where the hard wood board is peeling the paints as well, until dry and warm weather comes along ideal for painting.