I recently took my 2010 Double Cab 4X4 to the dealer for its first oil change; they "gave" me 12 months free maintenance when I bought it. According to the service invoice, however, they put 5W20 oil in the 1GR-FE V6 engine instead of the recommended 5W30.
When I went back and asked the service advisor why they didn't install 5W30 oil as Toyota recommends, he said that they put 5W20 in everything because of "the climate"--in Albuquerque, New Mexico! We seldom drop below 10 or 15 degrees F in the winter here, and in the summer our temperatures regularly flirt with the century mark. In the southern part of the state, 100 degrees plus is a regular occurance.
One might suspect that using only one viscosity range of oil has less to do with the climate than it does with wanting to stock only one type of oil in bulk, but I am astonished at such blatant disregard for the manufacturer's recommendation for something as vital as engine oil on the part of an authorized dealer. The service representative did say that 5W30 would probably be available "from cases" (in bottles?) on request, but at additional cost.
I think my truck has seen its last oil change at this place, but I wonder if anybody else has encountered this sort of cavalier attitude toward engine oil viscosity from dealers. I also wonder how Toyota might feel about it. I have thought about shooting them a letter, but will they just stand up for the dealer?