It would be nice if the car manufacturer would qualify/recommend a synthetic oil alternative replacement.
I just don't feel qualified to pick a synthetic oil.
I did a Google search and happened to find part of the Consumer Report taxi test you mentioned. In that article they say
But there is little indication that the brand or weight needs to be given serious consideration, and synthetic oil has no discernible advantage over the old stand-bys.
http://www.triumphspitfire.com/Oiltest.html
But then there was this said in another link.
The synthetics offer the only truly significant differences, due to their
superior high temperature oxidation resistance, high film strength, very
low tendency to form deposits, stable viscosity base, and low temperature
flow characteristics. Synthetics are superior lubricants compared to
traditional petroleum oils. You will have to decide if their high cost is
justified in your application.
http://www.unofficialbmw.com/all/misc/all_oilfaq.html
I am just as confused as before and frozen into inaction
Don't know if this is of help or interest, but I had saved this link awhile back regarding oil filters.
http://minimopar.knizefamily.net/oilfilters.html