u/I_love_to_jack_off

I'm gonna rotate my tires myself this time because the company I bought my tires from got bought out by just tires, and just tires refuses to honor the free rotation my original supplier gave me as an after sale perk.

Anyways, my question is, is it better to rotate front to back on the same side, or better to go diagonal?

So my car has been running fine. This morning I started my car up and I had a CEL and emissions systems warning.

I had an oil change scheduled and during the check in process, the tech said my oil was low.

They changed the oil and the CEL was gone

Could low oil have triggered the CEL for emissions issue or is there something bigger I need to worry about?