Just had my mk IV Golf in for its 3rd annual service. I was surprised that its spark plugs don't need changing for another year.
This means the car still has the plugs it left the factory with.
Does this seem right - should I change them anyway?
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If it starts and drives,leave alone.
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Maybe slacken and retighten every year or two to prevent seizure?
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Thr reason for plug's long life is twofold 1.Unleaded fuel-so not much build-up of muck on the electrodes. 2.One or both electrodes are plated with Platinum-usually a P or PP at the end of the plug ident. number.(if they have C or CC-they're copper plated-not as long-lasting).
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I change my plugs every 2 years as a general guide. When you get it done is really up to you.
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As long as you haven't had any problems (misfires, oil burning, wrong fuel etc) then they should be fine. I would remove them and put copper grease on the threads though - there's been much discussion on here about siezed plugs. Do make sure you replace them with the correct ones when the time comes.
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