Hi Davfrank, thanks for your time, I did not know that the original spark plugs for the Nissan Quest were those of Platinum I always avia you of the normal (and cheaper) but you always learn something new. In fact I had been thinking of putting it on this ocacion of platinum and with what you tell me because the idea is reinforced. Now with respect to the time band, it was changed about 4 months since the water pump was first decomposed and incidentally I decided to change the time band, and very in time since the original did it and I was already about to break which would have brought me huge problems to the engine (and to the pocket). That is why I always recommend doing the services every time the owner's manual specifies it and not every time the vehicle breaks down, but well I already extended and it is not my intention to bore them, I thank you and when I change them I inform you how my troka feels.