One thought I have after reading Doug's last post is what was the reason to pull the SL? I do not know the composition of R. However, based on Castrol's history I could be led to believe that the phaseout of SLX could be due to its higher cost. In a sense they determined that the 0w-30 was not selling well, so why bother. Bring in a cheaper synthetic, price it a little more aggressively. Volume would increase and still the margins were higher.
Just a speculation. I do not always believe that newer is always better especially when it is accompanied by a price reduction.
Just a speculation. I do not always believe that newer is always better especially when it is accompanied by a price reduction.