Yes, you can apply any kind of lubricant to the bearings. Be sure to dry any excess once you have sufficiently lubricated the bearings. Additional lubricant can actually cause dirt and grit to to get stuck in the bearings resulting in additional wear and may result in the bearings ceasing.
How do I maintain my skateboard?
How do I choose between a Longboard and a Shortboard?
What do you mean by "wheel hardness/softness"?
What is a contact patch?
Can I use WD40 on my bearings?
My trucks are squeaking whenever I turn, what is causing it and how do I fix it?
Is there traction tape on the deck?
Is there a kicktail on the board?
What hardness are the stock bushings for each skateboard?
What is the wheel hardness, size and contact area for each skateboard?
What are the indents above the wheel on the deck for?