See also:

Replacing spark plugs
Replacing spark plugs If replacement is required, see an INFINITI retailer for servicing. Iridium-tipped spark plugs It is not necessary to replace the iridiumtipped spark plugs as frequently as ...

Octane rating tips
Using unleaded gasoline with an octane rating lower than recommended above can cause persistent, heavy spark knock. (Spark knock is a metallic rapping noise.) If severe, this can lead to engine damag ...

Engine serial number
The number is stamped on the engine as shown. ...