What can cause oil leaking past piston ring & going to spark plug & tick noise?

Hello, this could be due to a valve seal issue, or could be from a piston ring and cylinder wall issue. I'd first take a compression test of the engine and perform a leak down test as needed. I'd check the PCV system to ensure it's operating properly. And then it may be necessary to remove the cylinder head to inspect it fully and check the pistons and cylinder walls. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops