Just received a phone call about some services my X needs. Took it in for an oil leak and oil service. They found the leak where the oil sensors is so there covering that under warranty. They also want me to change sparks plugs, front and rear differential oils, transfer case fluid and circulating air micro filter.

I guess my question is do I need sparks plugs with 40k miles. They stated every 3rd oil change! Fluid changes all around?

Thanks in advance.