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Spark Plugs - When to change?

25K views 4 replies 4 participants last post by  jeremybingham  
I am pretty sure that the second or big service is the spark plug change. Usually about 3 years 30k miles. I would never leave any spark plug in any longer than that. It goes 2 years the brake fluid then the big one filters and plugs etc all done. we have our coolant done every 5 years too and I will do gearbox oil at some point around the 50 k mark.how say the coolant is for life but is bas f g48 and they say 4 years!!!!!