30000 miles
thank you
According to the owners manual, they have platinum plugs that should be changed at 100,000 miles.
About every 50,000 miles.
about every 75000 miles
you have 2of the plug wires on the wrong plugs or distributor cap
Heater plugs in a ford focus 1.8 engine should be changed every 18 months-2 years.
Once on 1-2 year on regular spark plugs. Once every there years on High end spark plugs.
A standard spark plug should last about 50K. A platinum tip plug should last 100K.
Every 60,000 miles.
100K
There is no way for us to know that.