My ses light came on, using oil with no visible leaks, and oil build up on plugs on 2004 Nissan Murano

Hesitation, power failure, and strong exhaust smell. I think I know what it might be but I'm not a mechanic but I plan on taking my car to the shop soon to get diagnosed and don't want to be taken for a fool thank you

Asked by for the 2004 Nissan Murano