Very Very concerning. I have just posted a similar topic under the topic "Kluger front differential problems" (until David kindly told me about this one), I have a 2010 KXS AWD Kluger (bought new) that had a whine in the diff (after only 20,000km) when cruising in the range 60km/h-70km/h (no other speeds) and has just been repaired (Got it back 2 days ago) by Toyota under warranty. After questioning they told me they had basically rebuilt the front diff (new pinion, etc). The service dept refused to give me a loan car, only giving me the option of hiring one (wish I had of read this topic earlier!). It took just under 2 weeks to get repaired at Terry Shields and whilst the problem appears to have been fixed I have only driven it about 20km since I got it back. I read with dread that the whine problem had returned in some instances. This is also my first Toyota (and first brand new car) so I will seriously consider selling it if ther are many more problems (such as clunky steering, power/acceleration problems, etc that are topics in other threads). Otherwise very happy with the Kluger - just P*^%ed off about the inherent problems and quality of customer service from the service department (all smoke and mirrors).