I bought a used 2013 3.7L, but it didn't come with an owner's manual, so I'm wondering what the service interval is for spark plugs. Current mileage is about 80,000. Online sources seem to indicate 100,000 miles, but I'd like to hear from somebody who has an actual owner's manual that came with the car. I see the intake manifold has to be removed to service the plugs, so I'd rather not replace them unless I have to. No mods to the engine other than a recently installed tune. Seems to run fine.

 

100,000 miles in the Owner's Manual

 

Thanks!