oil change

I just bought from 1st owner a 2007 FX35 with 80K miles with all service records. Time to change her oil - should I switch to a high mileage oil since she is over 75K miles or stay conventional? Inquiring minds would like to know!

Has anyone ran the Signature Series 5W-30 Synthetic Amsoil? All my previous and current have been changed over to SS Amsoil. Just curious as I have ordered amsoil for my 11' qx56.

We are taking care of our brother's Infiniti while he is deployed overseas, serving our nation. We drive his car once a week, about 3-5 miles each trip, to keep it in running condition. The last oil change was done 6 months ago and in that time the car has been driven about 2,000 miles. Do...