hi can anyone tell me when the auto gearbox fluid should be changed for a 1.4i vtec i shift ex 2010, the car has only done 22500 miles , I purchased it from main honda dealer with 16300 very low mileage but the car only did 1500 in one year?? before mot it had only had minor/part services done by main dealer up to now , car will be due service shortly should I ask for a fluid change for the auto gearbox, also should the spark plugs be changed on this service??? should i have just standard plugs fitted or should i ask for I believe iridium??? longer lasting plugs, and how long do these last for and are they worth the extra cost??? if anyone can give me some advice i would be thankful, also I am a bit confused as to the type of gearbox this car has is it a cvt?? and what fluid would be best for it?? thanks everyone!!