Aygo spark plug replacement based on mileage or age?

[fordulike]

Do the dealers replace the spark plugs on a service, based on mileage or age of the vehicle?

At the 4 year service, will they replace them regardless of mileage, or take mileage into account as whether to replace them or not?

[FROSTYBALLS]

Either time or mileage based - whichever occurs first.

Suppose if a car has done particularly low mileage, one could query whether time based replacement is necessary.

[Plob]

Can't speak for authorised Toyota dealers/service establishments, but for myself, plug replacement has always been based on condition, rather than either mileage or age!!!

[mickburkesnr]

It's a milleage/age thing, which ever comes first.

When I service mine I change the plugs regardless, so mine get changed yearly at the moment.