Went in for the 60,000 Mile service today and they changed the Reduction Gear Oil. They didn't call me to check if that was OK or not so I had them eat the cost. It was $12 and change for the oil itself. Its an inspection item anyway so I'm sure it costs them very little in additional labor to replace it.
They did just fine financially with the service anyway, I opted for an interior detail the cost of which has increased in price from $99 to $139 which was agreed up front. I do the detail each 15,000 to try and keep that light interior in decent shape, its worked so far.
Blue SL-e, Res 4/22/10, Ord 3/29/11, Del 7/30/11
Lost 5 Capacity bars
7/18/13 (29,206), 8/25/14 (51,728), 7/12/15 (71.108), 5/12/16 (88,362), 10/17/16 (96,532)
New Battery 12/3/16 (98,956)