Re: DIY log book service for new Grand Cherokee.
I've always done my own servicing since new.
As long as you always follow service schedule and recommend lubricant specs then you will be fine.
I always used OEM filters and parts in case there ever was an issue, saves a possible 3 way argument between Jeep, you and an aftermarket supplier.
Just keep all receipts and detailed log of work performed.
I have never had an issue with warranty. They would have to prove that something you did caused or contributed to a failure to deny warranty.
As mine was a 2012, the auto requires servicing every 50k. This is the only thing that I would get the dealer to do and it would cost me a $100 more then getting it done by others. Reason I would get them to do this so they would also take the opportunity to sweep through with TSB's, software updates and recalls.
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JGC Overland CRD, Deep Cherry Red
"I'm just here for the biscuits!"