Sonicare DiamondClean Rechargeable sonic toothbrush
5 modes, 2 brush heads, USB charging case
There is oil on my Philips Sonicare toothbrush.
If there is an oily substance around the base of your toothbrush handle or near the area where the handle base joins the handle body, there is no need to worry.
The likely cause is a small amount of lubricant used in the assembly of the handle. The residual lubricant can be easily cleaned off the handle using a small amount of isopropyl alcohol (<=70%) on a clean, lint-free cloth or paper pad.