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there are four spark plugs.
Replace the spark plugs and the spark plug wires. Replace the air filter. Replace the oil and oil filter. Replace the fuel filter.
If you do not have any problems with plugs, change them when you replace the timing belt (do not forget to replace the spark plug wires too).
6000 miles
How do you replace the spark plugs on a Peugeot 307?
Every year, or as an when the service requires
on the motor
Replace them every 100,000 miles.
How to replace spark plugs in a 1989 jeep cherokee?
Depends on the type of spark plugs. Factory plugs around 70 - 100k depending on the condition of the plugs. I would replace the spark plugs out with some AC Delco iridium plugs they will last you 100k+.
Every 60,000 miles.
No, they don't necessarily have to be replaced. However it is usually a good idea to replace the wires along with the spark plugs. As the wires age and go through heating cooling cycles they get stiff and brittle. As you flex the wires to remove them from the spark plugs the inner conductor often breaks causing a misfire. Also when you pull the spark plug boots off of the spark plugs the connector often can break loose and stay on the spark plug, thus ruining the wire.