Should fuel injection cleaner be used as a preventative maintanence even if car is running all right?

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1995 Buick Skylark with a V-6. What alternator brand have you had good luck with?

yes but use one that actually works BG44K is what is used by the dealers to clean your injectors. I ron a can through every 20000 and have never had an injector problem. It also cleans the carbon off the upper intake

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2000 Pontiac Grand Prix RPM oscillating?

I do.
My thought is "why wait for the problem?"

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'99 Jeep Wrangler - What does a high oil pressure reading mean?

No. The additives in gasoline sold these days does not require that cleaners be used

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How do you know if a custom intake is too small or too big?

It will be a waste of money if the car is running fine. Use it in the winter to help with water in the lines.

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what is the spark plug gap for a ford mondeo?

I have heard of fuel injector cleaner damaging o2 sensors, but I have no personal experience of this. I ran fuel injector cleaner in my car and felt a significant difference, so I am sure it works, as for a preventive... Maybe once a year?

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