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spark plugs are used to ignite the fuel-air mixture in a petrol/gasoline engine.

6 votes
2 answers
10k views

Is it necessary to replace functioning spark plugs?

I have a 2000 Mazda Protege that last had it's spark plugs replaced about 4-6 years ago (about 40k-60k miles). It's a commuter car, but it's a short commute and mild driving conditions; probably 85% …
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