2010 Nissan Xterra Questions

All 2010 Nissan Xterra Questions

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There is no slip while changing gears, but while in drive at a stop and sometimes while mobile, I will hear this whining noise. When in park and sometimes at a complete stop it goes away. Someone recommended transmiss...
"Gently" used vehicle, no towing or off road use.
The vehicle has 45k miles under normal usage (not off road) and my mechanic is recommending a differential oil change.The Owner's Manual is silent on this service. Does this seem appropriate? Many thanks.
At a stop light my heat-air coming out of the interior vents go cold and warms back up when I start moving again. The Heat gauge is in normal operating range and coolant level is normal.